Yep, now would be a good time to start topping and lst'ing if you're wanting to prepare it for a scrog net. They look really nice and healthy too btw.
Yep, just take off the top node and throw it back into veg. You can repeat as many times as you'd like depending on what size plant you want. Topped less, you get a taller plant with more side branching and topped more, you will get a much shorter and bushier plant -- either way, your yields should be comparable. I wouldn't remove any leaves at this point -- it looks like you have plenty of light penetration as of right now.
