That's a pretty good guess, yes. You can wait for the letter from the IRS and reply to it directly. While the advertised processing of 1040X is "up to 16 weeks" we are currently seeing MUCH longer processing times, even for electronically submitted amendments (it is possible to e-file 1040X, though not 100% of the time).
The IRS may (and likely will) send you the notice while the amendment is still pending, which creates a mess.
If you've not heard from the IRS within a few months, then I would proceed with amending the return. But I'd give time for the 12C to get to you first.
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