Should I say I'm captain?

I’m a rising Senior, and I play a Spring Varsity sport at my school, and am almost very sure that I will become a Captain.
But, I will not be informed of that decision until early mid-January, which is after I submit college apps.

So should I list myself as a captain for 12th grade on the Common App, or not mention it at all? I was thinking not to mention it because although I am very confident of getting the position, nothing’s set in stone.

You could say something like anticipated captain for 12th grade if you don’t know before apps go in.

Ok I’ll do that, thanks.