Coming out to my brother tomorrow

I've basically been telling him that I had something important to say to him for a while and now I can't escape it anymore because I said I would tell it to him tomorrow

I am somewhat worried of what his reaction will be but he is also my best friend and generally supportive of me so I hope that he will accept me and stuff

This will be the second person I come out to after my gayden friend who I only came out to because he is also trans and an extremely nice person, but my brother is cis and very critical so it adds a bit of a ”challenge“ when it comes to coming out

Anyways, wish me luck thx