You want to flush for 2 weeks, the trichomes will change during that time. You dont want to start your flush to late going off trichomes, as the potency will start to degrade.
Looks like you're in the "harvest window". You need to check trichomes to be sure though.
More milky means more thc, a heady psychedelic effect. More amber means more cbn, a body-numbing, relaxing, and sleepy effect.
When you harvest and the trichomes are milky, you'll have more of a heady high. If you wait until the trichomes are half amber, you'll get more of a stony effect.
It is a grower's choice
Peace