You can check the status of the migration using the output XMI file. For that, execute the Check Status of a Migration service.
Provide your login credentials for DOORS Next and then the migration output file from above.
The resulting status will be in the Tree view.
The result is a summary of the migration as well as a preview of what actions still remain. As observed above; the changesets remain open so the contents need to be reviewed, and some modules have links that need to be created.