Ask "PGT" and you can discuss what they offer and your options.

I’m hoping someone here can give me an estimate for the dimensions of standard vinyl windows

Are you looking for accurate information?

What style window? What series? Singles or mulled units?

Standard dimensions for windows???? Surely you're joking. Check with the manufacturer.

@PPF. - Thank you! That's exactly what I needed. I appreciate your help

That would qualify as checking with the manufacturer or asking PGT. But note that all published information is subject to change.

A ball park would be something like 6" +/- from edge of glass to edge of glass, but as the others have already stated, that can vary substantially from one product to the next. You will want a maesurement specifically for that product to have an accurate measurement