To add progress bar in the script

Hi All,

I want to add the progress bar in the below code which is UI functionality the part of my Folder Automation Script. As of now the main UI has been greyed out until the files move from the input folder to Output folder. Its not more interactive. Is it possible to add the progress bar until the copyfile function to complete the process?

mainUI();
function mainUI(){
    var dialog = new Window("dialog"); 
        dialog.text = "Partner Asset Automator"; 
        dialog.orientation = "column"; 
        dialog.alignChildren = ["center","top"]; 
        dialog.spacing = 10; 
        dialog.margins = 16; 

    // PANEL1
    // ======
    var panel1 = dialog.add("panel", undefined, undefined, {name: "panel1"}); 
        panel1.text = "Asset Matrix CSV file"; 
        panel1.orientation = "column"; 
        panel1.alignChildren = ["left","top"]; 
        panel1.spacing = 10; 
        panel1.margins = 10; 

    // GROUP1
    // ======
    var group1 = panel1.add("group", undefined, {name: "group1"}); 
        group1.orientation = "row"; 
        group1.alignChildren = ["left","center"]; 
        group1.spacing = 10; 
        group1.margins = 0; 

    var editPath1 = group1.add('edittext {properties: {name: "edittext1", multiline: true, scrollable: true}}'); 
        editPath1.preferredSize.width = 350; 
        editPath1.preferredSize.height = 40; 

    var pathBrowse1 = group1.add("button", undefined, undefined, {name: "button1"}); 
        pathBrowse1.text = "Browse"; 

    // PANEL2
    // ======
    var panel2 = dialog.add("panel", undefined, undefined, {name: "panel2"}); 
        panel2.text = "WW_Handoffs Folder"; 
        panel2.orientation = "column"; 
        panel2.alignChildren = ["left","top"]; 
        panel2.spacing = 10; 
        panel2.margins = 10; 

    // GROUP2
    // ======
    var group2 = panel2.add("group", undefined, {name: "group2"}); 
        group2.orientation = "row"; 
        group2.alignChildren = ["left","center"]; 
        group2.spacing = 10; 
        group2.margins = 0; 

    var editPath2 = group2.add('edittext {properties: {name: "edittext2", multiline: true, scrollable: true}}'); 
        editPath2.preferredSize.width = 350; 
        editPath2.preferredSize.height = 40; 

    var pathBrowse2 = group2.add("button", undefined, undefined, {name: "button2"}); 
        pathBrowse2.text = "Browse"; 

    // PANEL3
    // ======
    var panel3 = dialog.add("panel", undefined, undefined, {name: "panel3"}); 
        panel3.text = "Output Folder"; 
        panel3.orientation = "column"; 
        panel3.alignChildren = ["left","top"]; 
        panel3.spacing = 10; 
        panel3.margins = 10; 

    // GROUP3
    // ======
    var group3 = panel3.add("group", undefined, {name: "group3"}); 
        group3.orientation = "row"; 
        group3.alignChildren = ["left","center"]; 
        group3.spacing = 10; 
        group3.margins = 0; 

    var editPath3 = group3.add('edittext {properties: {name: "edittext3",  multiline: true, scrollable: true}}'); 
        editPath3.preferredSize.width = 350; 
        editPath3.preferredSize.height = 40; 

    var pathBrowse3 = group3.add("button", undefined, undefined, {name: "button3"}); 
        pathBrowse3.text = "Browse"; 

    // GROUP4
    // ======
    var group4 = dialog.add("group", undefined, {name: "group4"}); 
        group4.orientation = "row"; 
        group4.alignChildren = ["left","center"]; 
        group4.spacing = 10; 
        group4.margins = 0; 

    var Start_Button = group4.add("button", undefined, undefined, {name: "button4"}); 
        Start_Button.text = "Start"; 

    var Stop_Button = group4.add("button", undefined, undefined, {name: "button5"}); 
        Stop_Button.text = "Cancel"; 

    //--------------------------------------------------------------------------------
    pathBrowse1.onClick = function(){
        AssetCSV_File = File.openDialog("Choose the Asset Matrix CSV File");
        if(AssetCSV_File != null){   
            editPath1.text = AssetCSV_File.fullName;
        }
    }
    //--------------------------------------------------------------------------------
    pathBrowse2.onClick = function(){
        Handoffs_Folder = Folder.selectDialog("Choose the WW_Handoffs Folder");
        if(Handoffs_Folder != null){   
            editPath2.text = Handoffs_Folder.fullName;
        }
    }
    //--------------------------------------------------------------------------------
    pathBrowse3.onClick = function(){
        OutputFolder = Folder.selectDialog("Choose the Output Folder");
        if(OutputFolder != null){   
            editPath3.text = OutputFolder.fullName;
        }
    }
    //--------------------------------------------------------------------------------
    Start_Button.onClick = function(){
        if(editPath1.text == "" || editPath2.text == "" || editPath3.text == ""){
            alert("Select the respective text fields and run the script...");
        }else{
            mainFlag = true;
            dialog.close(1);
        }
    }

    //--------------------------------------------------------------------------------
    Stop_Button.onClick = function(){
        dialog.close(0);
        alert("Process Cancelled...")
    }

    dialog.show();
}

//--------------------------------------------
if(mainFlag == true){
    GettingInputFromCSV_UI(File(AssetCSV_File.fullName));
    if(Replacement_Content_csv.length>0){//Replacement_Content_csv // Rules_styleMapping_csv
        for(var a=0;a<Replacement_Content_csv.length;a++){
            FolderNames.push(String(Replacement_Content_csv[a][0]));
            SubFolderNames.push(String(Replacement_Content_csv[a][1]));
        }
    }
// Progress bar need to add for this function
    folderCreation();
    copyFiles();
    alert("Process Completed...")
}