This is such a cool new feature and iPhone users get it, too, with Assistant and Translate. Stephanie Condon:
Interpreter mode can help you communicate with others who speak one of 44 languages.
How do you activate it?
With a prompt such as, “Hey Google, be my German translator” or “Hey Google, help me speak Spanish.” Google’s AI-powered assistant will then provide translations that you can hear and see on your phone. It will also suggest “smart replies,” so you can respond without speaking and speed up the conversation.
This is more or less a live conversation between two speakers– two languages– that listen to each voice and translate accordingly. Don’t forget to speak slowly and carefully, though.