Yep harvest time. If you squeeze the cones the mature ones spring back, the immature ones will stay a little squished and not bounce back. Definately harvest the cones that are browning at the tips. It's up to you if you want to continually harvest or cut them all at once.
Congrats, and it sounds like your bine really took off for being so young.
............Alright Brain, you don't like me, and I don't like you. But lets just do this, and I can get back to killing you with beer......~Homer