A few things first. What type of medium are you growing in? Soil, coco??? And what nutrients, organic, synthetic.
Also they look like they could still go a little longer. Why I say that is because the claxy don't look that swollen yet. You could still take them if you want but I would wait it out till they swell up real tight. Also I like a bit of body to it as well. The amber is an indication that it will have some body to it, but each strain is so different when it come to looking at trichs that it can become confusing. White Russian likes to have clear, cloudy and even a few ambers all next to each other that I just gave it 70 days (10 weeks) so I could get density and a nice swollen look to the claxy.
Anyways if your in soil running organic, don't worry about a flush, they don't really need it and organic sequesters nutrients so well that flushing does little to nothing for them, some people disagree with that and if you feel the same then do what I suggest next.
flush at least one week from harvest. Unless they are pure indica it's very hard to go too long into flower, 9 to 10 weeks may not even be enough some strains can go up to 14. So pick a date based on how close they look. Ie hairs are mostly to all orange, and claxys swollen up as if they have seeds in them. Thrichs whether cloudy, clear or amber are a way many people judge due dates, but sativas and hybrids are hard to judge due time by thrichs. Not saying you can but ime they are so varied having such a mix of clear cloudy and amber that they never seem completely ready. Maybe the 20 something strains were not helpful over the years, but once you have clones you know when they are done and so far I find 70 days to be a good starting point to go off of. When in doubt I go 70 days and judge from over all ripeness look. Like a bud from skunk or high times.
but a good flush is best done a week to two weeks prior to harvest with three times the amount of weather to pot size. So a 5 gallon pot would need 15 gallons then wait a few weeks and let her stave and turn most the leaves yellow, purple, orange, or maroon depending on strain, and how cold your nights can get.
Hope this help and happy growing.