Is 9 1/2 months too soon?

Peach

I have been seeing this guy (friend with benefits) for almost 10 months. I have recently began developing deep feelings for him. He’s been trying to spend more and more of his freetime with me in non sexual ways. I want to tell him so bad, but is it too soon? Or if it hasn’t been said by now maybe it’s not mutual? Can someone give me some advice please? Lol