If you mean 'run macOS apps on Linux', Darling [0] already exists. Running command-line applications is already possible, GUI applications less so.
If you want to run Windows Games on macOS, that is also very much possible. Wine runs on macOS and Apple have themselves developed the 'Game Porting Toolkit' which provides an implementation of D3D12. I understand the best way to use that these days is to use CrossOver [1].
