I'm on the same boat man, I really dislike body stone and that's why I'm growing uplifting energetic euphoric sativas. Or sat dom hybrids. Here's a link to high times article from Mel Frank.
https://www.rollitup.org/t/2nd-grow-c99-and-super-lemon-haze-feminized.626355/page-6#post-9117940
At first I was all going for clear trichs, not even milky. As I went deeper into the study I see now that this is a vague thing. Yes for most sativa dom plants you are looking for clear trichs over milky, amber, peak potency over degraded THC, but there is so much more to it.
When the plant is at it's peak potency is a combination of things that differ per strain genetics, your dialed in environment and bud formation etc etc.
I am now looking for these things:
swollen calyxes
they tell a lot about when plant is finished.
receding pistils
that is a usual indication, but some plant pistils die off and some plants are still shooting new pistils even when they are finished.
capitate stalked swollen resin glands.
the shape of it and the quantity of that.
they should look swollen, but keep nice shape. You can get a feel of it by the size of it's mushroom head, if it's not yet mushroom head, then it's too early, if it starts loosing shape then it's too late.
and last but I'd say second most important factor after swollen calyxes is color.
bare in mind that amber can be eithed degraded THC(CBN)
BUT there is early transcluent amber which is not degraded thc. I's where top potency is located. Not all genetics have it. But if you have the right genetics, you dial in your environment, you provide lots of sulfur, give UVB you will see some nicely looking transparent amber heads between your clear headed capitate stalked resin glands even before resin will start going milky and you will KNOW that this will be some mega smoke
So as you see there is so much more than a simple clear, milky, amber.
also degrading thc will not give you stone, but sleepy mellow effect, less energetic. Indica dom cannabinoid profile gives body stone over head high. Either way, I doubt you are looking for any of them.
There is a lot of thing to take into consideration here and all will come with experience. I'd say you have to grow same plant couple of times, play with harvest windows and other factors, observe and only then come to conclusion. And not even from seed, but clones from same mother, cause even same C99 can be different in so many ways. From simple clear head euphoric racy 'meh' high to the same but with positive, trippy additive that gives you lot of laugh and boosts sex exp.
From your pics I think you still have 3-4 weeks to go but I understand that this is a no no for ya, so just writing for your future grows.
And If I were you I would already go and chop little sample and start drying and then curing. As I said you need to experiment to get to the place where you're heading
Sorry for the ramble. Hope you did not fall asleep in the middle of post haha.
And thank you man for detailed PM reply, now I know exactly what I'm looking for! I knew you're the one to ask and not only from pic quality, but the other details in it like font selection, perspective etc etc.
Rock on!