Time to switch to Flowering?

As long as you have the space keep vegging and topping as many times as you can and let them get as big as possible, but remeber they will get about 2x as tall in flowering, so you wanna do some lst to keep em low so the branches go sort of ddiagonally tending more to a horizontal position and not vertical, this will allow for more vertical toom but then you must consider the side space, if your plants can all fit, and if they by the end of veg, then in flower you shouldnt have any issues as then you let them grow vertically and they have plenty of room cause you trained to take up more horizontal space and during this period she got bigger, stronger and more established. Good luck and stay lit growmie, veg for as long as you can allow it to, keep in your mind that every week they veg its an extra bag of weed. https://youtu.be/jK8fAUlqbow?t=38

It really depends how much "enough" is. Long story short; if you can wait then do as you will get more bud. However if you can't wait then these guys will be fine to flower