Check the trichomes with a jewlers loop or digital microscope… If they are clear not ready
Don’t forget : patience is key here! If you don’t have a jeweler’s loupe, some camera can zoom enough to see the trichomes clearly.https://www.growweedeasy.com/wp-content/uploads/2010/05/when-to-harvest-cannabis-diagram.jpg
You have to get a nice little magnifier, I use a mini microscope, and look at the tricones. When they are all white and start turning amber is the best time for all plants, especially with sativa. Yours look fat and dank good job maybe a week or two more check them every day. Also when you are looking keep an eye out for red mites, the can fu up in just a few hours. Look for fungus growths and aspergillus, look them up get familiar.