You’ll see a "Generate Audio Overview" button appear, and after a short wait, about 40 seconds according to Google, you’ll get a fully voiced summary. The audio pulls from top search results and delivers a conversational recap, featuring two voices that play off each other to make the experience more engaging.

Google tests AI Audio Overviews in mobile search, letting users generate podcast-style answers for select queries

Google's incredibly fun Audio Overview with their virtual podcast hosts are now available as an experiment in Search Labs.