The truth is that EE gets updated Round the Clock. People get ghost mails all the time. Ghost mails are mails from CIC saying there is an update in your profile but when you login, you cannot notice any visible change.
Yes, the application can update anytime during the day.
However I have read in some of the threads on the forum that most of the updates happen on Tuesdays and Fridays. Co-incidentally, I had my application updated on Fridays so far