Always check the trichomes on the calyxes, trichomes on the leaves always mature faster.
I would think you still have 10-14 days to go on this plant, maybe even 21.
Once there are 98-99% brown pistils/hairs, you will be entering the harvest zone.........check the trichomes on the calyxes then.
BTW, not sativa dominant strain at all, looks much more indica dominant rather than sativa.
Reducing your lights on time by one hour can help the plant to finish up more decisively if you are getting impatient.