Harvest time?

Depends on the type of high you want. Regardless of terpenes and genetics if you harvest with milky thrichomes its the peak of the effects you get sedative and active high. If you wanted fully active high, harvest with clear+milky cristals. If you want it basically fully sedative, just hold on for a couple weeks untill its fully amber crystals and you got it. Its up to you. I like to harvest them at a point where some might say its a premature harvest, but i know what i'm aiming for, it just blast my mind everytime, since i need to be active and can't even risk couchlock i harvest with clear crystals. I get less yield but i get the high i want, and its better to get 70% of what you like than 100% of what you don't really want. Stay well, and good growing growmie

Turn off your lights and take a photo with the flash on. It's impossible to pick out amber trichomes under blurple lights. Going by the hairs, looks like you have at least 10 more days. You want 80-90% of the hairs to go red before harvest (usually, trichomes are a much better indicator 10‐20% amber).