you can check daily if you want to, but i don’t. after 4 grows i have gone to checking trichs before i water because i want the plant to be mostly dry when i chop. in looking at where your microscope is positioned i see that it is quite a ways down your plant. when i check trichomes to decide to harvest i check the four biggest buds and get the shot right up towards the tip of the bud (within an inch or half inch). there are some who check different parts of the plant, lots of ways to do this stuff. i will also tell you that “suggested flower time” is just a guess. i chop at 10 to 20% amber and have gone 1 to 4 weeks past on my grows. if you want couch lock, you got at least a couple weeks before you will get to 40 or 50%. but i grow fems and not auto’s so it might be different, but i suspect not much. you are right, things can change fast, but not within a day or two. in my experience, the buds almost double in size the last two weeks before they are at best potential, so if you have seen your buds explode this last week then you might be real close, if not, maybe you got some time left.