MacOS Metal support?

Unity 5.6 & 2017 now have experimental macOS Metal support.  

When will Shader Forge offer Metal support or is there already a way to implement(switch it on with shader code)? 

SF currently launches in Unity 5.6/2017 with Metal Editor active but shaders generated in this environment yield a warning that says OpenGL must be activated.

Please advise when time permits, thanks in advance.