If this is for your 2016 return and you will owe taxes with the new W2, you have until 4/18/17 to pay taxes owed without a penalty. If you are due a refund there is no penalty. If you don't get a letter from the IRS, they most likely did not fix it. You can also check Where's My refund, they do put information if a return is adjusted.
An amened return can take 8 to 16 weeks to process. You can check the status of an amended return.
Tracking your amended return. You can track the status of your Federal amended return using the IRS website ?Where's My Amended Return? or you can call 1-866-464-2050, (You need to wait about 3 weeks from the date you mailed your amended return for information to show up in their system).
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Also, see the following about not receiving your W2.
What if it's February but I still don't have my W-2?
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https://ttlc.intuit.com/replies/3301808">https://ttlc.intuit.com/replies/3301808</a>
How do I file a substitute W-2 using Form 4852?
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