i'd focus on non-fox-tailing bits. Really need a 30x magnificaiton. The pics only show a couple top colas, which isn't enough to give a good suggestion on harvest timing.
pistils
trichomes
density...
3 observable traits you can assess to choose a proper harvest date consistently from grow to grow. experiment with early middle and late.. .can even take some off now, then a bit more a few days later, and then again a week or 2 later.. i'd probably keep a staggered harvest to a 10-14 day window? it is stressful, but if you keep the window shorter, not even a nanner could grow in time let alone viable pollen to worry about. the point is a staggered harvest is an option.. sometimes to just try out an earlier harvest outcome and sometimes because lower growth may need another week to ripen.