Yes, get it sent off as soon as you can. Explain that you have already requested the MR and this is to go with it. Don't forget to put your name and NINo at the top!
We are finding that DM's are sometimes doing MRs very quickly, before the claimant has had time to submit everything that wanted to. We will deal with that if/when it happens
Nothing on this board constitutes legal advice - always consult a professional about specific problems