After looking at your diary, you still have 10-14 days to go at least, it is still too early to harvest.
Once there are 98-99% brown pistils/hairs, you will be entering the harvest window...........you still have many, many white pistils and mainly clear trichomes that I can see, meaning you still have much ripening to occur............post this question again once you get to that 98-99% brown pistil stage.
2 days of darkness is ghetto science, there is no need to do it...........it is an urban myth with no scientific or biological basis!