When using the Locator/Collector Task: you can read the TXT files in the "<installDir>/Report" folder to identify which file has been found/copied etc.
However; when you are Migrating using the Migrator Task: you only have 1x status change on the individual PST file (Admin console > Site > Personal Store Management > All Files > Files). You can see the history of previous task runs against this file, but you cannot see live metrics.
I suggest adding 'view live data' button - to pull the live process/thread information via WMI. This data is available when using Sysinternals ProcExp (process explorer). I cannot find this information within the SQL table structure - until the thread closes (task completion/interruption).