Would suck if you have to chop those huge colas off. I would try to give the LST away from the light if possible. Either way looking good, this is an auto-flower? what hours is it on? they should stop stretching their third week in flower?
If your plant is not showing bloom signs, then chop it, it's not blooming.
If your plant is blooming, even if little tiny white hairs, then LST and bend the main stem so it's the desired height.
Keep on the great care!
Happy smokes!