Very soon. 63-70 days you can get fems done quicker than that. So, you count flowering days. As soon as you see stigma, (pistils).. id say by having a guess, and that's all this is. You are entering the ripening phase. As I can't look back. But gen it takes 9-11wks..aa
Hard to say without a loop. You want to be aiming for 70-95% cloudy. Depending on your pref of course. Me, I harvest when it gets into the high 80, low 90s or you can keep your going and wait until she throws off a fade. If that strain does, and even then, that's not always gonna happen, "the fade", but, when she's fully ripened you'll know as she'll pull herself from drinking at your normal pace. That, and you need a loop/microscope 30x. And, then, you'll only truly know when it's harvest time.
Have a look at other grows of the same strain.
Good Growing