The Data Migration Status app provides a summary of the status of all migration objects. This app uses Situation Handling, which automatically informs a responsible user to a task that requires their attention. This is beneficial when working with large volumes of data because you may not want to watch the screen and wait while simulating the migration of a 100MB migration object template. You can work on other tasks in the SAP S/4HANA Cloud system and wait for the notification to appear in the top right corner letting you know a migration object has completed the Simulation or Migration steps of the guided migration process. The Situation Handling templates that alert you of these two status changes are automatically enabled in all SAP S/4HANA Cloud Public Edition systems. Selecting the link in the notification menu brings you to the Data Migration Status app to view more details.

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Note
Find detailed FAQ information about the Data Migration Status app in SAP Note 2681413.
Extended Statistics in the Data Migration Status App
Within the Data Migration Status app, additional details about migrated data is captured in Extended Statistics. Information like source values, target values after mapping, and target IDs can be used to validate or audit your migrated data. For example if you select the Statistics link for the CO - Cost Center migration object, you can further drill down into the Company Code or Cost Center Category.
Selecting Company Code tells me 2,000 records were imported for this migration object in Company Code 1010 (the SAP standard company code for Germany). I can further display the actual records and export this data in Microsoft Excel format, or share via email or by creating a tile to display on my SAP Fiori Launchpad. The Extended Statistics feature is activated by default, however you can change the settings for each individual migration object of whether to capture, or not capture, extended statistics data.

Note
If you turn off extended statistics logging for a migration object, future data will not be collected, but past data will also be deleted.