Not on day 1, but within the first week usually. You can tell for sure if you know any friends that have gotten an invite from a specific program. Sometimes interview slots exceed invites sent, but I think there’s a way to see how many slots are taken. If you didn’t get an invite, it means the program didn’t think it was a good fit. While it can be disheartening, at least they are ripping off the bandaid early instead of giving false hope.