When to chop??

Hello!! First ever grow, thinking about 2-3 more weeks... But I don't know shit lol.
I'm in week 10, flipped to flower on 4/20 and growing Jack Herer.

If you flipped april 20th that jack still has about 3.5 4 weeks. Wait for some amber trichs. (Week 10) of total grow. Count your weeks from start of flowering