Lol, some answers.
Okay.. so don't my all the seedling and veg time. As ALL autos flip and grow dif.
General rule is, in pre flower right through till ripening takes from 35-56 days. Some autos are much faster than others.
I've had fastbuds done flowering under 40 days and some took 60. Autos are so unpredictable. There is NO SET time buddy.
You want a 30x scope or JLoop. A good new phone like an S22. You can see the trichomes/pistils up close.
So, before harvest you see are looking for 90-95% frosty/milky.
As I see it. You are what 21+ days into flowering. So, as it gets nearer the 40 days you'll know to start looking now. Thats if your weeks are right? That's some serious size cola this young.. gonna be a monster.
Enjoy.
BTW, feel free to DM me if you need any more advice if you feel I can help, & that pretty much goes for everyone on here.
Good luck & enjoy.