if you can, let em veg a few more weeks. i like to wait until alternating branching is well underway as that's usually a sign of maturity so it's also the time for sexing. yours should be getting close as alt. branching begins around week 6 or so. once you get them sexed, watch the lower branches for taking cuttings and you can greatly increase the yield with the clones with little added effort or time. it's another good reason to let them veg until mature...