Harvest this weekend?

You've got some beautiful flower there. Well done. Personally, I'd leave it another week. Hard to tell as pics are a little blurry, but first shot looks like the calyx still have some clear left in the otherwise cloudy trichomes. As for the volume of calyx' they look great, but could probably swell a little more. Third pic shows a fair few white pistils (could be strain specific to throw new pistils out at end of harvest), personally I'd wait for more of them to be browned and shrivelled. Just my 2 cents, but given you're under the reccommended time to flower - I'd feel confident pushing a bit further (as suggested harvest windows are typically shorter than necessary so seed-companies can profit further). Might be good to know what kind of strain you're growing - what medium and wheyther it's photoperiod vs. autoflower. Happy Growing and Congrats on the great work so far!