Can someone tell me how long before flushing can take place?
It’s hard to tell from one pic, but judging by your pistols (white hairs) you have a way to go. Get a 30x loupe or higher and keep a close eye on the trichomes. When they first start turning amber begin your flush and add no nutes.
Try for pics in natural light. I’ve posted blurples pics, but it’s hard to discern anything in that hue.
You have few months left if not a bit more. The lighting sucks but those aren’t new pistil’s they will turn red soon.