making process of script show

Im having this script which turns randomly some layersets in different groups and then apply a random opacity and blending mode to them.

The script works perfectly now but when i run it, I dont see the process of it (the layers opening one by one and the opacity and blending mode changes). At one point I had it working for some unknown reason, but then it just stopped.

Im thinking its more of an option to turn on in photoshop then something to put in my script but maybee im mistaken!

I need this to be able to present my script and that people are entertained and dont have to wait till the end to see the result, I want this built up effect...

Anybody know how to achieve that?

Thanks!