Sims 4 Studio is now available in a version for Mac. The link is HERE.
If you're asking whether Studio will have a version that Mac users can use the answer is not any time in the near future. Until the current incarnation of Studio is perfected this is what the focus is. Studio was written in part on a bootcamped Mac though so it's definitely possible for people with a Mac to use it through Bootcamp.
Will there be the build option soon? Need to make some snow terrains.
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