I believe that xSchedule on Mac OSX has been deprecated. I think the last time it was included, was in one of the late 2019 downloads. I went to go find those, but the archives all point to the Apple Appstore page now. So, if you aren't finding an xSchedule binary on OSX, you aren't crazy.
Looking at my own machine, the binary for xSchedule is from Dec 3, 2019, while xLights is from Sep 12, 2020.
I believe that it was becoming too burdensome to keep it forked for OSX, combined with low usage on the platform. In general, the recommendation is often to utilize FPP on a Raspberry Pi.