How do colleges see online courses?

I am a senior, and I’m taking AP Stats online. I’m not done segment 1 quite yet so I don’t think it went on my transcript for my mid-year report… how will colleges know I am taking it? It is the reason that I chose to have late arrival at my school (I don’t have a 1st period since I have the online class). I started it a bit late in november so that’s why I haven’t finished segment 1. Also, it is on FLVS. Do I need to tell each college that I’m taking it by email? I put it on common app but they probably want evidence.