No, it will not hold up your return. Ignore the fact that you had PATH for a moment. It usually takes months for the IRS to catch up to something like a missing W-2.
If you were to amend today, you will mail the return which would take several days. Then it would sit at the IRS with all the other amendments coming in. Then they would match your return, see that indeed you did not report the income and process the amendment. This is not a quick process.
