Hi, I prefer flush more than to late, the trichomes do not seem to be milky on your photos so it’s hard to say,
Continue with your schedule but if you want to flush you can
I wish you a good harvest
From what I see, it looks like you still have around 2 weeks to go. I'd start watering them with Advanced Hydroponic's Final Solution to decompose and remove the last residue of fertilizers in the growing media.