This article is always the best resource for efile start and stop dates: https://accountants.intuit.com/support/en-us/help-article/electronic-filing/e-file-start-stop-dates-....  It was updated in November.

There were also product notifications and at the top of the communities pages there is an information notice that says "E-file start and stop dates have been updated for this tax year. Learn more here." which links to the article above, as well.  Our support was closed Christmas and the day after Christmas, however, it is open.