oright let me start by saying your plants look wonderful man and no you will be just fine with them bushes if i were you i would get the screen in there now . some actually like to put the screen in there in vegg and LST before they add a screen but this is not needed all the time..
let some growth come through it over time or you can set the screen lower and weave the bigger tops around into the screen. and let the shorter ones grow..
depending in the future you might wanna lollipop you plants take off the lower bud sites to focus on the "lush tops" sites..
these are alll opinions from my expierence with SCROG
i put my screen in a little to late but it worked out fine i could have a had a much evenier canopy if i would have put the screen in there earlier..
but heres some pix of my last scrog
there first pic are like 2 week flowering
and advance from there
i weaved the tall tops into the screen to allow the shorter ones to grow throught but they didnt have enough time too
.
as you see some tops are taller than others this is what you want to try an avoid.
but this was 4 plants under 1 screen and what a bitch it was..
this is why people start early with scrog for an even canopy..
check out Doob's grow this is what i mean starting it early and with LST
https://www.rollitup.org/grow-journals/175767-doobs-complete-grow-journal-got-4.html
this is all IMO.. talk to others too im a wierdo for sure