I have CarPlay enabled for my app (CarPlay Audio App (CarPlay framework), CarPlay Audio App (Media Player framework)) and the lessons I'm following suggest I need to add CarPlay as an application extension to my app in Xcode (My Project -> Targets -> My App -> '+' -> iOS Application Extension) but CarPlay is not an option as an extension. Has this step been deprecated or am I missing something in Xcode (this is my first app so yeah there's that).
CarPlay apps are not app extensions; they run as part of your main app binary. Some additional functionality, like Siri, does make use of app extensions in some cases. Please see the CarPlay app programming guide for more details.