This exact situation happened to me lol. My merch was supposed to come Monday, but ended up arriving today.Woo, just got my IRyS merch! 3 days earlier than the 'expected' date given when it first went out. I think I still have more coming though, because some other event happened shortly after and then I felt dumb because I didn't wait to bundle them together for shipping costs.
I thought it was bundled with Sana's merch, but I was mistaken. Those were bundled with some Subaru birthday merch which got delayed to late February, so I gotta wait until then for those.