Hey dude, very good looking plants you got there so far.
I just wanted to tell you, harvest when your plants are done, not when the calendar hits week 8.
Ask around and search, to learn how to identify when they are done. Watching the all pistils turn orange and curl back into the swollen buds is a reliable way to tell, from what I've learned.
I know you might be anxious, as I was on my first time, I was watching the calendar like a boiling pot. But now I know better, and even tho I do keep up with how much time it has passed, I know they will take as much as they need and there is no better way than to be patient, and wait for the flowers to get properly ripe.
I wish you good luck and keep posting on the site to figure out the ripeness of your plant, over here there are some very knowledgeable people.