I've just now started shaving once a week or so at...what is it now, almost 4 months? I barely had peach fuzz before, invisible at any distance greater than 2-3 inches, and now what I have is a slightly longer, thicker form of peach fuzz that might be visible at 1-2 feet if it catches the light and you look closely. I tried shaving pre-T but the fuzz was so soft the razor slid right over it (even against the grain). Now...well, some of it gets shaved. Makes no difference for passing, but I kind of like the soft stubble feel on my upper lip.
At your age you're basically going through a standard, slightly late male puberty, and all your facial/body hair stages will be within the normal range for guys your age. Shave when you feel like it - it won't hurt your passability either way.