I can't give you an exact time frame but when those white hairs turn amber and sorta recede back to the buds you'll be real close. Looks sativa dominant so you could be in for a wait. Nice job! ps. try to get photos with the lights off in the future.
you are eventually gonna want a microscope of some sort to know exactly when to harvest. i understand the first grow is financially taxing. after trying several, I have one of these things on the way... will see how it does. Digital Pocket Microscope Magnifier 500x ZOOM 2.7" LCD Photo & Video 32GB Bundle | eBay If you can post new photos when the lights go off i think someone will be able to tell you close to the day. *edit 4/1/17: I received that microscope camera and sent it back. While it is a pretty cool device, it just did not provide the clarity when zoomed to view trichomes for me. they all appeared bright-white. don't waste your money. wish i could find something like this that actually worked. The best one i have found that works well for this is the carson zOrb digital usb microscope but it is very difficult for me to hold steady.