https://www.pcgamer.com/anthems-day-one-patch-will-actually-go-live-today/

Anthem was already out to Origin Access subscribers and everyone who had preordered when BioWare said that a "day one" patch would be released for the game on February 22, when it becomes available to everyone who wants it. Today, however, lead producer Ben Irving revealed during a livestream that it will be coming sooner than that—as in, today. 

"We're actually going to deploy the patch here in a few hours," Irving said. "We're going to do it with zero downtime, is the plan. And then we'll issue some comms for people to log out of the game and get the new patch and go back in, get on the latest servers so you can keep playing. We're excited to get that out a day ahead of worldwide launch."