White Trichomes Purple Punch

As a fellow newbie I suggest to google "when to harvest cannabis", and you'll get plenty of good articles on every major cannabis site, including respected breeders and seed banks, with great pictures and explanations of what to look for. I think you're confusing trichomes (they are normally called "crystals" or "sugar" or whatever when dried, much smaller that a sugar grain even when fully developed) with pistils — the long hairs that grow out of calyxes. I'm not sure if it's correct for all genetics and phenos, but generally there's no point looking at trichomes (tiny resin capsules on bud surface) until most pistils (hairs) have turned orange/brown.

You still have 3-4 weeks to go...........never believe the sales pitch! Once there are 98-99% brown pistils/hairs, you will be entering the harvest zone.

not even close to ready still white hairs coming out...2-3 weeks and youll start seeing change in thricholmes...

This plant looks to have several weeks left. I wouldn’t even be checking trichs yet. It’s covered in white pistils and looks as if it’s just starting to fatten..like now.

Don't look at trichomes this early. It'll just give contradicting signals. trichomes do age before harvest time. They get covered up by new growth etc etc. Wait for the plant to fully plump, then start paying attention to the trichomes - on the calyxes only. Harves will be 7-14 days after that point, most likely. Quite a bit of variation possible for many different reasons - some we control, some we do not. Based on this pic, you have 3-4 weeks remaining. It's hard to be accurate guessing this as some plants ripen faster than others. Unless this is an autoflower, i'd stop using a flash or getting light on the plant during dark cycle. Gonna cause some nanners or worse, a re-vege. Cooler temps can slow things down. Probably get some "Fall" colors in the leaves, too.