Hello, they are looking beautiful but as you can see many of the pistils are still white, you need to wait to them to get 80-90% brown, they already starting to turn brown as you can see, the leaves will start to turn yellow because the bud is getting the nutrients from there, you should start to flush them because you don’t need more nutrients. Another precise way to watch if your plant is ready is to get a x40 or x60 loup to watch the trichomes, when they start getting cloudy almost all of them it’s the time to harvest.
I hope it helped you!
Good grow! ✌️🏼