I'm confused about how that will work - in order for him to be able to certify/notarise the copies, surely he must have the originals in front of him to compare them so he can certify that he has seen the originals and that the copies are exactly the same?
Can you not just have your wife overnight the originals to you using FedEx/UPS/DHL?
If she sent them tomorrow, you could have them by Monday , or you could always reschedule the biometrics appointment for a later date to make sure you have everything.
Do you have the original documents of everything else as well? Such as her financial requirement documents (bank statements, payslips, employer letter), original sponsor letter from her etc. If not, she will need to mail them to you as well.