Blueberry is enjoying this soil. Growing and sending branches. Why the hell Pineapple Express is not growing in the same soil mix, or it is the matter of genetics?
Bend it two times already, it reacts good by stretching the branches, now it is time for supercropping
It's good to get as much light as you can but try to avoid heat stress.
To your other question there are some weeks to go because the pistils are still white. Wait until they turn brown and frizzy. For the best moment you will need a microscope for checking trichomes.