this is my first grow so im beginning to get a wee bit excited how much of a yield will come from that big plant. guesses only as nobody wud know spot on. also, is it possible to tie the fan leaves to the main stem? because that wud give me so much more light to the buds, or will this hinder the plant by reducing the light it can use? thanks for all the suggestions

p.s it does need to stop growing !! now at 41 inches lol
the other plant is growing the same also, now at 28-29 inches
i only have another 5 inches and then i cant move the light anymore and id have to start eating into the 18 inch distance.