Looks to me about another week, there seem to be quite a few white pistils still. Harvest once there are about 95-98% brown pistils for a head trippy THC high or wait until all pistils are brown for a more sedating CBD body stone. It comes down to your preference of effect.
The leaves going yellow is not necessary, it all depends on how well she is being fed, particularly nitrogen. At this stage, I would be only giving her plain water, nothing else, as a final flush before harvest in the next 5-10 days, as far as I can tell from the pictures on a computer screen!
Hope this helps,..........
Organoman.