First time grower go easy on me flushing help

Ok so I'm running a soil based 4x8 dimmable digital 1200 hps set up with 5 gallon pots and 8 autoflowering strains, 3 FastBuds gorillaglue auto, 3 shortstuffs purple gorilla, and 2 nyc diesel autos by Barneys farm. The breeders says 8-9 weeks from seed to harvest but I want to push to week 10 or 11, I am currently on week 8 day 3 and would like to start my two week flush, based from these pics should I wait to flush or start now?
 

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