Time to harvest ?

No where near buddy. Its the hardest part is watching them ripen but you do have to do just that, watch them. When 70-80% of the pistils(whitehairs) are turned brown and your leaves start to yellow slightly. This is when I check closely at the trichomes, take the best quality picture you can and zoom in. You're looking for some specks of Amber for your flush indicator.

I wouldn't harvest her for at least maybe another couple of weeks. She's still throwing out white pistols and the buds will get much more dense. I'm pretty new to growing and I've just started harvesting myself but I bought a microscope you can plug into your phone/laptop so I can look at the trichomes... It was such a good buy and for the price of £20 or around $25 if USA. Mine was a Jiusion digital microscope. Look for 70% milky trichomes and 30% Amber that's a good time to harvest. If you don't get one of these wait until most of the pistols have turned Amber and curled in.