Guys today I found a stable version of Google Camera in XDA which can take awesome portraits. This app can be used in S7,S8,Note 8.No need to wait for portrait mode. Check this out- https://drive.google.com/file/d/1-G7pojhQUHirxWwFuQ5WctmXC_jBYps2/view
Please adjust these settings before use-
Model: Nexus 6 Portrait mode on all models: on camera.af.debug.show: off camera.faceboxes: on
And thanks to miniuser123 who created this awesome app.
