The Ambers i presume are more towards the tips of leaves and outside edges, and your calyxes and younger leaves are more the ones that are composed of more clear heads. Yeah sounds good trichome wise.
Something to consider is the age of a plant and its ripeness you actually don’t need a scope for, when you start seeing less and less new pistils/calyxs forming and things like buds stop bulking up and start to stretch at the tips, or they take on a brown/golden/yellow hue its all just signs that the plant is slowing down, whether it’s natural aging, or has being induced to go quicker warranted or not, which doesn’t really matter, it’s just the plant finishing out.
Ripeness is also subjective to what you want, for example some people like pushing their plants further out cause their goal is to make hash, the amber and dried resin heads make it easier for extraction, where as other may be making live resin where they are trying to capture all those lower volatiles “smells” and terpenes before they age.
Now a scope or a loupe which is what i use if i “want” to look is really just another tool that helps add another data point persay to what we desire and or what we are seeing as those don’t always align, but do we need it no, it just can help one learn things by looking through a different perspective.
You chop when you either desire or need too, but it’s ultimately your choice, what comes of it whether a plant that needed to be chopped if say it had aged to a point longer than you wanted, or say chopped early because you personally were just done with it, its what you wanted or had to do in the end and that’s just it, it’s yours to own…
As for my comment about the small auto, my suggestion was more that at the stage it’s looking and the size it is, it’s not gonna be much at all in the end, and that starting some new seed would be a better use of your time and that pots space, now if your learning from it then by all means keep it, start asking yourself why is it that it stayed small, what can you do differently on your next round that will change that, and set about trying again