2-3 weeks, you want the pistils to be red/brown and shriveled back into the caylx. The trichs should be cloudy. The amount of amber trichs you want is a personal preference.
If your Kush autos popped on May 5, theyβre about 9 weeks in now. Most autoflowers take around 10β12 weeks from seed to harvest, so youβre getting close! Check the trichomes, cloudy with some amber means theyβre ready. Youβve likely got 1β3 weeks left.