Cable-free Android Auto has been available since 2018, but the list of compatible smartphones and car units has been limited. It seems like this will improve with the broader roll-out of Android 11, as Google will support all devices running its new OS and fitted with 5Ghz Wi-Fi connectivity according to its FAQ page.
Until now, Android Auto Wireless’ connectivity has been limited to Google’s Pixel and Nexus phones as well as a small number of Samsung Galaxy devices. The list has been steadily growing since it debuted with Android 9 Pie. If you want to check whether your car or stereo system supports the Android Auto Wireless, visit this Android Auto’s page.