CoE will be PC only.

Isn't there a way you can get a Windows OS on a Mac?

Mac / Linux Compatibility was a high kickstarter stretch goal that sadly was not achieved. It has not been revisited since then, and doesn't seem very likely at this point.

The base client is planned to be written using the Unreal Engine, so in theory it could be ported to other platforms but Soulbound has many other higher priorities at this point in their development cycle.