As expected, Google has added a feature to the Search Analytics report within the Google Search Console to filter out how your AMP pages are doing. It basically will tell you which queries lead to your AMP pages being shown in the Google mobile search results.
You can access this under Search Analytics and clicking on the "search appearance" filter. Here is a screen shot:
Google just announced this on Google+ and said "we've just started rolling out a change in Search Console's Search Analytics feature that lets you drill down to look at how your AMP pages are doing in Search." Google added "you can filter for AMP results ("which queries lead to my AMP pages being shown?"), compare how their metrics stack against other search results links, or see how the visibility of your site's AMP pages has evolved over time. It's visible for all sites that show AMP pages in Search."
I just gave it a try and it is really cool to see this data broken out like this.
Hopefully more filters to come!
Forum discussion at Google+.