Hey,
when no new pistils are forming anymore or at least 95% of the pistils are brown, you can be sure that your plant is definitely not growing anymore and is in the maturing stage.
When your trichomes are mainly milky and a few are amber, you can harvest well. Of course, you can also harvest now, but then you'll lose in quantity and effect. I would wait until a few trichomes turn amber, then you can be sure that most of the other trichomes are milky and have the perfect effect. Right now, there are probably still many glassy ones and therefore less potent.
I estimate about 5 more days, then you'll be at a good point.