Help on when to harvest and flush! day 40

Hello! This is my first grow, I've been flowering for exactly 40 days now, and I'm not sure when start flushing and when to harvest. The strain is grand master kush, which is master kush x grand daddy purp. Here are some pictures, advice is greatly appreciated.
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it looks really good for your first grow man if your not sure when to start flushing then start on your next watering. and your plants will be ready when you can see all amber colored hairs, not white ones.

Thank you. I think I'll start, all the hairs are still white except for one small plant which has about 5% amber hairs. Anyone know what the flowering time of master kush or grand daddy purp is?

Let it go until a min. of 56 days (8 full weeks) in my opinion. If it's still sprouting some with white you can cut the main ones and leave the smaller to keep growing. I wouldn't cut anything at 40 days. Good luck.

I wasn't going to harvest at 40 days. That's just where I'm at. I appreciate everyones advice, I wish someone knew about this strain.