Your employer have until 01/31/19 to provide the W-2. Make sure that they have your current mailing address.
You can import the W-2 if your employer uses one of the TurboTax import partners as their payment processor.
See this TurboTax support FAQ for importing a W-2 - https://ttlc.intuit.com/questions/1934390-how-do-i-import-or-enter-my-w-2
