You can review more detailed documentation in the Oculus Developer Docs.
5.1.0p1 onward works with Oculus Runtime 0.5.0.1-beta on Mac (10.9+). We plan to still support mac via 0.5.x runtime, but as Oculus announced, Windows + Gear VR is where Oculus’ primary focus will be for the near future.
Since MacOS does not currently support direct rendering, adjusting your display settings to rotate the Rift’s display by 90 degrees is necessary for the DK2. The display settings are located in System Preferences->Displays.
Be sure that you can deploy a Unity app to your Note4 or S6 (see Getting Started with Android Development)
You do not need to install anything extra on your machine to deploy to Gear VR.