I would doubt it! Macs aren't sold with NVIDIA cards, so I'd guess the support for them would be poor, if available at all. I don't think Swift has full releases to Windows or Linux yet?

Fast.ai and the likes have been investigating Swift too, so there's some momentum/ desire to switch to Swift.

I don't believe it will go anywhere, Fortran, C++, Python and Julia are what matters in GPGPU.

Even Java and .NET have better support for CUDA than Swift ever will.