Oh nooo, how annoying! IDK if this is possible for you, but could you call the library and ask them if they have an ETA? We tend not to mind questions like that, even if our answer may be "sorry, I have no idea either", and depending on the day and whether you're not rude about it (which I doubt you would be), we might even go above and beyond and make sure that book gets processed next (if it's at the library already).