I might have misunderstood what this functionality was for.
From my point of view the STATUS should have been available as soon as the INIT command has been executed.
I read The STATUS command is used to periodically poll for updates of media processing operation. as a solution to have information about the upload process and whether the media is available after the FINALIZE has been executed.
But I have probably misunderstood the documentation. I will try after the FINALIZE.