looking to scrog my grow

hey guys just wanted to scrog my 4 master kush plants..

just transplanted from 3 gal to 5 gal containers.. was gonna flip next week. what do you guys think?

should i wait for the center of the tent to fill with growth or just pull some bigger branches towards the center during the stretch period?

and also... how they lookin?

How old are they

not sure 8-10 weeks would be a guess.. didnt write down when i cloned em