You still have to bake the smoke simulation using Blender. Khaos is here to add the particle systems you want to use inside of your simulation more efficiently. It is not its own smoke simulator.
The 2.8 version of Khaos is ready. However unfortunately there is still a bug with sub-frame sampling for simulations in Blender 2.8. Until this is fixed in Blender development we will not be able to release the add-on for Blender 2.8 as simulation will not be as accurate as in Blender 2.79.
The plan right now is to update and enhance the plug-in as new versions of Blender come out.