Could start your flush now for sure. Those are top-colas, so assume a little deeper is not as ripe? 10% amber now in those pictures? a scope helps a bit, even though that one heck of a photo, wow. helps me guesstimate % by looking at a specific sized area in multiple spots on the plant. plus, how the light hits things in photos can be deceiving.
you can google varying and wide opinions on when to harvest based on %-amber trichomes you see. each to their own on that, and probably good to test entire window at some point to find out what we all like individually.