An extra day or two isn't any problem for sure, the problem is more what it says about DE and their professionalism that they keep missing the release dates they set for themselves and could prepare for as long as they like. Especially because this time they kinda tried to build up a hype train with the special code countdown so you'd think they made sure to deliver on time.
But to everyone who's dissapointed by it: Have you not learned anything? afaik DE hasn't delivered any patch with any kind of major content on time for over a year now. Be prepared that the patch is gonna be 1-3 days late whenever a bigger one is about to hit. Not saying that it's amazeballs that DE is like this, just y'know save yourselves some disappointment.