After install AMP plugin and validation, when you sign into Google Search Console and click on Search Appearance > Accelerated Mobile Pages, you’ll likely to be greeted with the following message:

We did not find any Accelerated Mobile Pages in your site

Accelerated Mobile Pages (AMP) are an open-source initiative to provide web pages that load fast and look good on mobile devices, even over slow networks.

If your AMP-compliant pages include a few additional pieces of information, they can also benefit from special display features in Google Search results.

AMP report

Don’t worry! Seems this happens to all as Google’s JohnMU has acknowledged reply posted by another user in a thread on Google Webmaster Central help forum as an answer, here is that:

Once you set up AMP pages, it takes a few days for it to show up in Search Console – it probably took 3-5 days last time I did this. It unfortunately isn’t an instant process.“.

So be patient.