Well, be prepared tomorrow, who knows, they might have prepared your certificate and the letter didnt just get to you on time. I have heard it happen many times in the past that couples do oath same day even when they didnt do interview same day.
Plus, it doesnt hurt to be prepared and ask. Max they will say no.
Well you have a reason to rejoice at least, your wife would be rejoicing tomorrow so please make it worthwhile for her, I will look out for you guys. Really looking forward to put a face to the ID