Our son was just like this. By two and a half I could hand him anything to read and he’d blow through it. We never pushed him either. Just kinda fed the desire for letters and words he had wherever he wanted.
He’s 8 now. He loves to read, but the difficult thing is finding books that keep his interest. He can read at any level, but he’s still only in 3rd grade. So he still just likes pictures. Lol!