Transition from iTunes to Apple Music

Only on macOS Catalina and nowhere else.

On Windows PCs, the Apple Music subscription service as well as all current iTunes features will continue to be available and accessible in the iTunes for Windows application.

There hasn't been any announcement regarding a date for a change on Windows, or even if there ever will be one. This is primarily a user-to-user support forum; other Apple users like yourself and we only have access to publicly announced information.