The average time for harvest according to Fastbuds is 30-40 days in flower.
growdiaries.com/seedbank/fastbuds/gorilla-cookies-auto
But that is not 100% reflective of some of the harvests times recorded in the diaries, some are at 11 weeks total time and others 13-15weeks but their growing styles might have a lot to do with this.
I would say just by looking at the videos in your diary they have a few more weeks, anywhere from 2-4. Keep up the good work!
As for pistils they will turn in time and its also a good indactor of when to harvest, I like to use trichome coloration vs pistils though. I have also been told some plants pistils will not turn as fast as others and give false harvest times but I have yet to see this yet in any of my grows.
Best Of Luck!