The site recommends giving 10 days after submission of the supp app before checking status on their site. I delivered my app in person only 4 days ago, besides, while I was there, the mail guy came in with a whole sh**load of apps--four huge containers! The receptionist's eyes got huge when the containers were set on her desk. Therefore, I would anticipate that it might take a little longer than 10 days.
Good luck!