So recent macs, 2017 iMac are powerful enough to run VR, and Steam VR runs on the latest Mac OS - Sierra. For other macs & laptops, with GPU that is not powerful enough, they have thunderbolt support, so that an eGPU (external GPU) can be connected. Thunderbolt connection is 40gb /s bandwith, so fast enough that the latest GPU can be fitted and used with an enclosure. There are several vendors supplying enclosures running at 300 watts for lower end cards to 500 watts power for the latest high performance GPU. I believe that AMD gtx560 is minimum spec, and generally AMD drivers are more compatible. So the problem now is VR content that is Mac compatible, currently very few titles are Mac-ready. For the majority you will need a bootcamp windows partition. But i hope dual format VR binaries will take off so that we are not so inconvenienced.
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