automate to remove image borders

Have you tried File>Automate>Crop and Straighten Photos?

Possible start points include:

https://community.adobe.com/t5/bridge-discussions/bridge-or-photoshop-script-to-check-jpgs-and-move-the-jpgs-with-a-white-border-to-another-folder/m-p/12155947

https://community.adobe.com/t5/photoshop-ecosystem-discussions/check-the-document-for-a-margin-or-border/m-p/12563008

I didn't document this one back in 2021, but it looks like I mashed up the code from another topic:

whiteBorderCheck();

function whiteBorderCheck() {

    // Capture original ruler units and set ruler units to pixels
    var origUnits = app.preferences.rulerUnits;
    app.preferences.rulerUnits = Units.PIXELS;

    var doc = app.activeDocument;

    doc.selection.selectAll();

    doc.selection.selectBorder(1);

    // =======================================================
    var idset = stringIDToTypeID("set");
    var desc990 = new ActionDescriptor();
    var idnull = stringIDToTypeID("null");
    var ref239 = new ActionReference();
    var idproperty = stringIDToTypeID("property");
    var idquickMask = stringIDToTypeID("quickMask");
    ref239.putProperty(idproperty, idquickMask);
    var iddocument = stringIDToTypeID("document");
    var idordinal = stringIDToTypeID("ordinal");
    var idtargetEnum = stringIDToTypeID("targetEnum");
    ref239.putEnumerated(iddocument, idordinal, idtargetEnum);
    desc990.putReference(idnull, ref239);
    executeAction(idset, desc990, DialogModes.NO);

    // =======================================================
    var idthresholdClassEvent = stringIDToTypeID("thresholdClassEvent");
    var desc1004 = new ActionDescriptor();
    var idlevel = stringIDToTypeID("level");
    desc1004.putInteger(idlevel, 128);
    executeAction(idthresholdClassEvent, desc1004, DialogModes.NO);

    // =======================================================
    var idclearEvent = stringIDToTypeID("clearEvent");
    var desc1007 = new ActionDescriptor();
    var idnull = stringIDToTypeID("null");
    var ref246 = new ActionReference();
    var idproperty = stringIDToTypeID("property");
    var idquickMask = stringIDToTypeID("quickMask");
    ref246.putProperty(idproperty, idquickMask);
    var iddocument = stringIDToTypeID("document");
    var idordinal = stringIDToTypeID("ordinal");
    var idtargetEnum = stringIDToTypeID("targetEnum");
    ref246.putEnumerated(iddocument, idordinal, idtargetEnum);
    desc1007.putReference(idnull, ref246);
    executeAction(idclearEvent, desc1007, DialogModes.NO);

    // https://community.adobe.com/t5/photoshop/how-do-you-get-histogram-mean-value/m-p/3857869
    var histo = doc.histogram;
    var mean = 0;
    var total = 0;
    for (var n = 0; n < histo.length; n++) {
        total = total + histo[n];
    };
    for (var m = 0; m < histo.length; m++) {
        var thisValue = histo[m];
        mean = mean + (m * thisValue / total);
    };

    if (mean === 255) {
        alert("white");
        //alert(histo);
    } else {
        alert("not white")
        //alert(histo);
    }

    // Return the original ruler units
    app.preferences.rulerUnits = origUnits;
}

Keep in mind that pure white may not always be pure in images, particularly if they were saved with JPEG compression.