Looks like lots of white hairs left so she's got a while to go. I have a Purple Kush plant that has had almost all brown hairs for the last 3 weeks but it didn't frost up much yet. Under close examination the trichs are still mostly clear and at least half haven't grown that nice ball of resin on the top yet so she waits for the axe. Day 63 today from the flip. It was a gifted clone and I've never grown that stain before so don't know what to expect from it but it sure didn't grow like the afghani kush I grew many times. Much smaller with smaller colas than I expected from a kush. I pollinated a small branch with a high CBD strain, OTTO#1, so may grow some of those and I'm going to try to reveg the plant just in case the stone is something that makes it worth saving.
If you haven't got one yet buy a small magnifying glass at least 10X so you can get a close look at the trichs to determine cropping time. I take mine when the bulk of the trichs are getting cloudy and there's an amber one here and there but still quite a few clear ones. Amber means the THC is breaking down to CBN and will give you more of a couch-lock high tho it's more the strain you are growing that determines the stone.
I would think you have a couple weeks left to go at least.