Technically speaking BG has not released it yet and might not for some time if ever.
EVILDARI found a hidden feature that was not locked off and shared it with the community. Had he/she not done that chances are none of us would even know about it existing.
I might however be possible to enable it on mac like it is on windows.
Oh okay. Because there was a forum for supreme ruler the great war, saying they got it working. So I naturally assume it was officially released and that it would also be available for supreme ruler ultimate and on mac.