Tragically, Postscript support has been largely removed from MacOS now. Apparently the language was weird enough that supporting it made some (in)security hacks possible. I guess I'm old ! I remember first finding out about it in 1986 when is very "leet". Postscript printers were big $.

I say tragically because Postscript was pretty key in making DTP as compelling as it used to be, which kind of saved the Mac in terms of being the "killer app" for it.

I think you may be able to run some kind of postscript support in some tool from Adobe, or even Ghostscript. And probably, the newer software is better, but it's sad that you can't view a postscript file on macOS out of the box now.