Forgot a w2

I have a question . Because I think I made a mistake on my  return  I filed my return and missed 1 w2 on this one, and I got the 4464c letter saying they are holding my refund for review .. should I amend that or wait for them to fully process the return then amend so I don’t cause longer delays ? Don’t they usually refund that or adjust it  my refund was accepted through turbo so I’m just so lost!