Right now it seems about half way done? It's a crude estimate. There is some talk that it will be done "end of 2015".
Also, Ionic Framework. Wow it looks great, but it does not solve ALL your problems. You can use it to create beautiful HYBRID apps, but not really for mobile web:
So if you use it, you still may need to support mobile web depending on your project requirements.
Now what about Ionic with AngularJS 2.0? It may take even longer for that. I read that Ionic uses some Angular APIs pretty heavily, and they are all changing.