Hey dude My lady has a few plants that look vsimular to yours. Green Dragon and Sour Diesel. I know she has at least 4-5 weeks to go. Those buds should be at least 1 1/2 - 2 inches in diameter. Have you looked at the trichs with a very powerful magnifier? That should be a great indicator. Clear trichs? Not ready. Starting to turn amber? Some people go by the pistols,others the trichs. The hard thing for me is when to flush fr 10-14 days before harvest. Very important ! Have patience