After you file

On 8/20 my amended return was marked completed.

In December, a letter dated 11/15   (  !  )  said a check was to be issued but that check was then held back.

In my case there was a good reason for IRS to do that.

 

In your case, there doesn't seem to be any reason for such a postponement.

Maybe soon, in January, a letter dated 12/15  will arrive for you.