I add my 2 cents again and I think , from your picture, another 3 weeks. That’s without looking at trichomes and only that your lack of yellow leaves say the plant is still nitrogen rich. The cycle of the plant is to grow, veg, flower, and make seeds for new plants and expire. In our case, we prevent pollination so no new seeds. I’ll also say that I wait 2-3 weeks longer than I would have done 3 crops earlier. The lessons on trichome observation implies that clear heads turn milky and then start to turn amber...this is not a 2-3day process on any harvest I had made but observations made over a longer term IN MY OPINION. The net result IN MY OPINION is a more powerful product.
IN one harvest, the fans were as yellow as possible and almost dry crispy brown. Microscope showed trichomes about 30-35% amber coverage and not wilted but fully upright and sharp. After investing months into growth, it builds anxieties wanting to harvest and start finishing the buds. I’ll admit it is tempting but I’d hold off. For what that’s worth