We are currently working hard on a native version for MacOS. However, this version will require Office 2016 or a Office 365 subscription.
empower for Mac will have the same functionality as our current version for Windows. At the moment, we expect empower to be available as a Mac version towards the end of 2018.
Until the time comes you can, of course, easily use empower on the Mac in a virtual Windows environment (Parallels, VMWare, Remote Apps, etc.).