First time grow

Put some bagseed from some smoke that had absolutely zero thc, spent absolutely no money on the grow as I have plenty of experience gardening I just wanted to know what kind of abuse cannabis can take, and get a feel how it grows as I usually grow tomatoes or peppers. I'm getting close to harvest but can't really see the heads of my trichomes to see the ripeness, however it been a solid 10 weeks since flowers began to appear and all the hairs have been orange for a couple weeks. Would it be safer just to wait another 2 weeks for harvest? Not that it really matter due to how genetics actually work but it does seem to show a lot of sativa traits.

Leaves have just started to yellow on the lower branches, I never used any nutrients growing in some happy frog soil but I just started to flush 1 week ago just in case.

I would try to find a way to get a closer look at your trichomes, jeweler loupes are pretty cheap, but from the photo it looks like it is almost done if not already.