Oculus Rift DK2 for OSX

I’ve developed and packaged a VR game for Windows and all works perfectly as expected. The same can’t be said for Mac OSX though. I understand that Oculus have stopped support for Mac and their latest runtime isn’t available on OSX. Does the UE4 Oculus plugin look for the latest runtime and this is why VR preview mode and entering Stereo mode doesn’t work? Using version 4.8.3

I am using UE 4.10 on Mac OS X 10.10, and I want to use Oculus DK2 to preview VR as well. However, VR preview button is always grey. I have tried reinstalled Oculus runtime and reboot. But it can’t work. Is there anyone can answer me if Mac OS X is not ready for VR preview currently?