On February 23, Google began showing AMP listings in the mobile search results, but it only rolled out to select regions.
A month later, Google has only rolled out the AMP-based news carousel in 12 different countries. Elena L. from Google listed the countries where you can find AMP-powered news in a help thread. They include:
There is no word on when it will expand to other regions or beyond the news carousel.
To learn more about AMP, see our Google AMP project category.