Hey bro! 👋
Yes, you can do topping on that plant below which is still on the border of vegetative and flowering stages, but do it as soon as possible, because it will soon show its hairs and flowers, and then topping will be pointless. Not to mention, it could slow down the plant's development by a week! 👆
Decide whether to do it right now without delay or it's not worth thinking about it if you're unsure! 👆
Good luck, my friend! ✊😇