Mainlining when 2 Flower

When mainlining and have the number of colas i want, when do I flip to flower. These are. Blue cookies 6 wks grown in coco . Adv. Nutes grow a n b . Water everyday, every 3rd water i flush ¼ strength, 3 gallon fabric, 4x8 T5 light

i'm guessing you already finished these plants off, but judging by the picture you overwatered them pretty heavily, and they are imo nowhere near time to flower. hope you're next grow goes better man