Should I start my flush today or ??

Flushing triggers a signal that initiates nutrient recycling/autophagy. Nutrient recycling is a key aspect of senescence, particularly in plants. Once medium is empty it takes a matter of hours to initiate. So do it whenever you want it no need to stagger the nutrients.

Hey 👋 From my point of view you should definetly start flushing… I would have harvested already. Your foxtailing progress seems to be in a pretty late stadium — you are way over THC highpeak. Screen your buds for budrod 🙈 Seems like a good job, and a huge harvest ! Enjoy 👊🍀🖖

What are your ideas of "flushing"?? Does it involve pouring gallons of water through the pots?? If so, don't do it, it is not necessary and it does nothing. Just stop all fertilizers/supplements now and give only plain water in normal amounts and at normal intervals and the plant will "flush" itself naturally. You are at the right time now (if not a bit late) to enter the final preparations for harvest........the so called "flush". By the looks of things, I personally would not leave them very much longer....the weekend maybe, and not longer than another 7-10 days unless you prefer heavy and sleepy "couchlock" effect over getting high.

it won't have any discernable effect as long as the canopy is strong enough to support any remaining 'work' , otherwise depriving it of building blocks does the opposite of helping the plant. the the building materials are supplied by the roots or cannibalizing the leaves are sufficient, it simply doesn't happen or less of it happens etc... law of conservation of mass. mass does not manifest from the ether. you're close enough and your canopy is strong enough (perfect isn't the threshold) that you can give it water only without issues. Saving time and convenience can be a good reason to do it, but don't think it changes the biological processes involved in building molecules related to ripening or cell maintenance. mineral content doesn't change and taste is not discernably different according to blindt taste tests. People 'feel' it makes a difference, but so far failed to prove it. The responsibility of proof is on the person making the hypothesis. They have done a poor job proving it, lol.