How can I detect if a save operation is in progress in Photoshop?

I have a script to save JPGs and I'd like to implement an IF statement before to start saving a new JPG.
If Photoshop is busy saving any file, wait, else save the new JPG.

Something like this:

function save(){
     var jpegSaveOptions = new JPEGSaveOptions( );  
     jpegSaveOptions.embedColorProfile = true;  
     jpegSaveOptions.formatOptions = FormatOptions.STANDARDBASELINE;  
     jpegSaveOptions.matte = MatteType.NONE;  
     jpegSaveOptions.quality = 10;    
     docRef.convertProfile("Adobe RGB (1998)", Intent.RELATIVECOLORIMETRIC);
     docRef.saveAs( finalJpg, jpegSaveOptions, true, Extension.LOWERCASE);
};
if (there is a document being saved){
     wait;
} else {
     save();
}

Any thoughts?