Topping is actually going to make your plants larger so be careful! It looks like you’re going to end up with some big girls so do yourself a big favor and keep up on your defoliation and consider lollipopping! You may also want to think about using yoyo’s or something similar to tie your ladies down and retain an even canopy, which will yield you larger buds. However, you need room for that.
Watch your nighttime humidity! Powdery mildew loves those temps and those humidity levels especially in a crowded space with juicy, leafy plants like yours. Consider running a DEhumidifier in the evening if you have a hard time controlling your humidity. You do not want a mildew problem. It spreads like pollen and then you have to clean e.v.e.r.y.t.h.i.n.g. (been there bro. it sucks)
With all of that said, those look like beautiful young ladies for your first grow.