Looking for a way to update smart objects from PSB via script

I've written several scripts to automate a lot of this image pipeline I'm working on.

The last problem to solve is this:
Setup:
Primary PSD -> Contains several layers that are smart object to a secondary PSB

Secondary PSB -> Has several groups, inside each group are other smart objects/layers

My current manual steps:
1. Secondary PSB -> Make 'next' group visible

2. Secodary PSB -> Save PSB (ctrl+s)

3. Photoshop updates smart objects

4. switch back to Primary PSD document

5. Export As PNG

6. Choose name {SecondaryPSB_GroupName.png}

repeat 1-6 several times

I have scripts that I can modify to accomodate most of 1, 5 and 6. I'm having trouble finding examples where the script saves the PSB as the same filename, and then I'm not sure of a solid approach to waiting for step 3 to complete, can sometimes take 40+ seconds

I tried something like this, but it is either silently failing (I'm pretty sure) and/or it just isn't updating the smart object.

function SaveCurrentDoc(destinationFolder, shouldClose){
    var psdOptions = new PhotoshopSaveOptions();
    psdOptions.embedColorProfile = true;
    psdOptions.alphaChannels = true;
    psdOptions.layers = true;
    psdOptions.spotColors = true;

    var doc = activeDocument;

    doc.saveAs(new File(destinationFolder + '/' + doc.name.split('.')[0] + '.psb'), psdOptions);
    if(shouldClose){
        doc.close(SaveOptions.DONOTSAVECHANGES);
    }
}