definitely start flowering
they will more than double and u will be so crowded in there. i think u are already going to be crowded in there before they are finished. make sure to cut the lower stuff that looks like it wont be much, or get much light. cuz it will suck good juice that your tops could be gettin more of
i have 8 plants
i have 1 plant that vegged 5 weeks
two did 4 weeks
two did 3 1/2 weeks
and the rest about 2-3 weeks
here some pics
1st off lower that light about 5 inches to optimise growth 2nd put them in the dark for 24-36 hrs to optimise and knock off about 2-3 weeks of flower and it boost starts flowering as well . i do it all the time and then within 2-3 days i have pistils showing and etc . and make sure you still have the same time that the lights come on at so 36 hrs is always the best for total dark period b4 switching to 12/12
I would cut the bottom branches off as well. Like the bottom1/4 of the plant. As far as the younger ones im sure you have thought to just stack them on something to make all the tops even.