XCP delete - show a list of all deleted files

Hi
Im trying to use xcp for deleting a huge amount of old files on a volume with 127963385 used indoes.
xcp seems a good option for this task as the speed of deletion is high, but I need to get a list of all files the have been deleted.
For reference: scan -l  - is listing files that matched the criteria, I want the same for the delete.
Tried to increase -loglevel to DEBUG but it doesnt give me the output I need. 
Is there any workaround / solution for this ? 
Scanning it first and then deleting will take too long ...

* Another thing that missing in the delete command is defining the threads as copy/verify/sync command have (-parallel) - what is the default for the delete command ?

Thanks