If you receive another W-2 after filing, then you'll need to file an amended return (1040X) to add the new information. You'll have to wait until your original return is processed by IRS and any refund issued. Then you can prepare the amended return in TurboTax.
IRS only accepts amended returns on paper, so you'll have to print, sign, and mail it.
Here's a link to the TurboTax support page for amending returns, which will get you started: https://turbotax.intuit.com/tax-tools/tax-tips/IRS-Tax-Return/Amending-Your-Income-Tax-Return/INF120...