Trichomes are looking nice. What type of plants are we talking about. Photoperiod , autoflower , strain all will have some effect on timing. Your trichomes are still almost completely clear so a while to go yet. Go on Amazon and get a magnifying loupe of 60x so you can see the thrichomes really well. There’s all kinds of thichome identification information on line. Get the loupe familiarize yourself with the information and images and your on your way. That’s how the rest of us did it. Happy growing!