A few good months after its introduction, the Augmented Reality navigation feature is finally rolling out for Google Maps users in the wild. However, this is only a test run that includes a limited number of users and there is no official date for the general rollout of this next-gen feature.
https://www.notebookcheck.net/Google-Maps-AR-navigation-now-available-but-only-for-some-users.406386.0.html