For 3 bux, get one of these...
https://www.amazon.com/Microscope-M...1536778129&sr=8-17&keywords=led+magnifier+60x
They look a tiny bit early to me but it's hard to tell.
Either way, it is never too early to harvest, only too late. I have harvested at 6 weeks and the pot is racy and definitely under mature. However, after curing properly, it does age and mellow. Just like some fruits that ripen 'off the vine'.
I never ever harvest amber (contrary to most people). I harvest shortly after they stop getting bigger. Usually mostly cloudy, some clear. Maybe an amber here or there. I have also let some crops go way too long. Wow, fucking sleepy time weed. LOL I like 'up' weed so, this is just my preference. Your mileage may vary. :)
The best way to know is to smoke some. Let us know how you like it.