Dinafem's website says "75 days comprehensive life cycle."
THC (but not necessarily other cannabinoids) is maximum while the trichomes are still clear
https://www.thcfarmer.com/community/threads/trichomes-thc-and-couchlock.30668/
Harvesting with half clear half cloudy works best for some of us.
As you pointed out, this plant seems precocious, and might be ready before 75 days.
A lot of pros don't flush
https://www.rollitup.org/t/the-grea...-and-in-depth-look-at-the-final-weeks.524474/
If it were my plant, and I needed herb, I'd cut off a few colas soon, and try them, assuming at least half the trichomes are cloudy.
Best would be to dry, but I've heard of people smoking fresh harvested. Drying typically reduces the weight by a factor of 5, so 5 times as much wet weight would need to be
Many people trust the same advice that early harvest is more cerebral, and late harvest more couch lock, but each of us should see whether that applies to us.