If you have already filed, then you will need to amend your return to add the W-2. You should wait until your original return has been fully processed and your refund has been received if you are expecting one before amending.
Then, use the instructions in the following TurboTax article to amend your return:
How do I amend my 2019 TurboTax Online return?
@Iselasnz
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