Looking awesome!
I've been topping plants for years outdoors but this method is in my view the best of the lot for indoor growing under lights.
My first attempts at topping/manifolding was a disaster. I killed dozens of seedlings by cutting too early and too low and the next season, on about half my outdoor crop, I made the mistake of cutting off almost all the bud growth and only left on leaves. I quickly learnt not to do that again.
it was around that time I tried my first indoor grow that was so disastrous that I gave it up and didn't try it again for more than 30 years. Glad I took it up again though!