No. After you select Transmit Returns Now, your e-file goes to pending status, where it will stay until it's either been accepted or rejected by the government. If it's rejected, you can simply go in and fix the error, add the W-2 and re-submit your return. If it's accepted, you would want to wait until you receive your refund and then use the link provided below to amend:
How do I amend my 2020 TurboTax Online return?
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