Hope You're "Feeding" them with their H2O Saeteurn! Outdoor Grow, eh? twelve hours of sunlight? O.K.; Depending upon Strain; would be your answer to "when" they're "ready"!
You're NOW in vegetative state; next comes Flowering state; then harvest state,etc..(state of whatever); I'm growing from SEED; two Strains from SOHUM;
Kona and Hula Buddha; both well established and hardy strains. Kona begins Flowering at 8 weeks; PRESUMING your vegetative state has been premium; i.e. that you've FED your plants What about Pests? Outside pests?? Sounds to me you've got at least another month until Flowering begins or ends! Then you've got to harvest! Use The Internet!;
You-tube has a bunch of films on how-to; You must register first though!