Search Console, a free service helps monitor and maintain site's presence in Google Search, including Accelerated Mobile Pages.
If you've implemented AMP pages on your site, you can now using search console check which of your AMP pages are indexed.
Keep in mind, after you create a Search Console account or setup AMP pages, Google will crawl only periodically. However, you can wait for "scheduled regular recrawl," or "you can request a recrawl."
To start using Search Console, first you need a account (sign-up here) and validate the ownership of your sites (here). Once your site is set up on Search Console, you can then see which AMP pages of your site are indexed in google search. Just open AMP Pages report under Search Appearance -> Accelerated Mobile Pages.
The Search Console report lists all AMP-related issues for AMP pages that are "not indexed," so that you can identify and address them.
Additionally, you can also monitor performance of AMP pages on Google search in Search Analytics report available through Search Console.
The report shows the queries that trigger your AMP pages in search results. It also compare how AMP pages stack against your other results. In addition, you can also see "how the visibility of your AMP pages has changed over time," said google.
To see AMP page metrics, such as clicks or impressions, select Search Appearance -> Search Analytics -> Filter by AMP.
Those new, can watch the video below to see how to verify your site ownership with Search Console: