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The launcher can be tricked to download Overwatch but it's not playable. Due to shoddy OpenGL support the shift lately actually seems to be away from cross platform games, especially from companies that use their own engine.

Most if not all of the Blizz games render using OpenGL. Heroes of the Storm used to have some experimental options to use Metal or OpenGL 4.1, however Blizzard got rid of them at some point. They seems to not be satisfied with Apple's drivers

And this is ending with new releases, starting with Overwatch. And according to Blizzard it has nothing to do with money or market share, but with Apple specific technology.

They've been the biggest supporter of gaming on macos, and with them gone, the future is looking grim (for mac gamers - obviously a first world problem).

You can't play Overwatch and Destiny 2 natively on a mac

I don't think Overwatch runs on MacOS.