thy won't fatten more than any remaining ripening. more calyxes won't pop out and fatten up out of nowhere. sometimes a new wave of pistils can pop out, but then you got 2 vastly different ripening timelines in your buds.
trichomes 10-50% or more amber - all sorts of personal preference invovled
pistils - mostly turned color
density of colas
some of that can deviate due to gentics. if it's ready, take it down.