When the pistils have receded into the bud and virtually no white or yellow ones are left, then start looking at the trichs for the cloudy/amber factor. Otherwise as said, it depends on the type of high you're looking for. My ballpark guess from the pics is about 2 weeks more to go. None seem to know or mention it, but it's wise to follow the moon to time your harvests. I noticed long ago that the plants in veg or flower go thru monthly cycles where odor and potency swings in time with the lunar cycles. Right before the full moon, just past the first quarter odor and potency definitely hits a peak. It's almost a no brainer one would want to try and time their harvests in that window. Like an old sodbuster I knew would say, "The moon rules the roots". To which I'd add, indoors or out. And cannabis is no different.