Yes, if you started preparing your tax return in TurboTax Online, your information will be saved. When your second W-2 comes in, you'll be able to pickup where you left off.
To sign out of your TurboTax Online account, click My Account (top right), then click Save & Sign Out. (Click the screenshot below for reference.) TurboTax will save your work and sign you out of your account.
When you are ready to resume working on your return, just sign in, click Take me to my return, then click Pick up where I left off.Can I save my return and come back later? https://ttlc.intuit.com/replies/3301211