Don't chop until you spot amber trichomes.
You should go for max percentage of cloudy relative to the state of the plant (have the calyxes swelled, pistils receded etc).
Just keep a close eye on the trichomes and let your plant fully realize it's potential.
oh lala I love that strain. It is soo tasty. I think that is a 8 week strain so you could probably harvest anytime from now to say 2 weeks. But yeah, chop at the first sign of amber.