Don't bother - I have a bunch of pages I moved to their own site on June 1. Its only been 6 weeks, but the majority of the pages are supplemental on the old site. They rank on the new one, but the 301 hasn't created a deletion from the index for the pages on the old site.
I assume this would mean that you deleting your pages would not change their supplemental status :(
Google seems to think reporting the past status of pages to Joe Surfer is important - I can't understand why.