Tough to call by one picture, but I would say you have a solid four weeks to go. Keep in mind, you want to have a late harvest if you are looking for a couch lock high, as the trichomes turn amber they become saturated with a chemical called CNB (anyone want to refresh me on the full name?) This chemical is the one responsible for that couch lock type of feeling that you are looking for. I am currently harvesting Sour Diesel, just took down a few of the bunch prior to the amber trichomes forming because I enjoy a more up high at times. I will let the rest of them go until 20% of the trichomes are amber... this apparently is the highest potency. Best of luck