How can I check if AMP is working or not?
When the extension is enabled and configured correctly, an AMP page can be reached when searching for a product in Google from a mobile device. In Search Results, you'll get a link to the AMP page with an AMP icon. When you follow the link, you'll see the AMP Page.
An alternative variant is to type /amp/ in the URL like this: example.com/amp/exampleproduct and enable mobile view.