Around here, most cats are spayed/neutered when they reach 3 pounds. And that’s basically the point where they are robust enough that the anesthesia isn’t very risky. I once had a kitten who needed to be circumcised, and he was a lot smaller than that, but since they had to anesthetize him anyway, they neutered him at the same time.
I gather there are regional differences in the age when vets do that.
Anyway, your kitty is gorgeous, and looks sweet. May you have many happy years together.