The feature was first spotted by Reddit user neo5468, who noticed that the latest versions of the Android Search and Auto apps enabled a new toggle for OK Google commands while driving. However, even if you have the new updates installed, Google appears to be limiting the expansion on an per account basis, so you may need to wait your turn.

It's been more than six months since Google's I/O conference, where it first shared that it would enable hotword support in Android Auto. The company also said at the time that it would integrate Waze, but that is also taking some time to surface.