Employers have until the end of January to provide your W-2's. Some may not yet be available for import, even if they are partnered with TurboTax to allow importing from a website.. And you usually need the actual paper W-2 in order to enter some information from it even to import it.
https://ttlc.intuit.com/questions/1934390-how-do-i-import-my-W-2
https://ttlc.intuit.com/questions/2588751-why-can-t-i-import-my-w-2