Simple question: did it?
We have official numbers for US: 459k for the first day only! Media Create just published their figures and they have it at 284k in Japan. That's 743k between two territories. So that leaves only Europe and RoW to be found.
Analyzing sales for Breath of the Wild, the game did almost 2x better in Europe than in Japan. Keep in mind that Mario Kart is a global success and tend to sell more on Europe than in Japan.
So if we have to be very pessimistic about Europe, let's say it did just about the same as it did in Japan... we would have a total of 1.02m, without taking RoW into account (and being very pessimistic).
Going through that, I think it's fair to say the game sold over 1m FW, maybe even first day. What do you guys think?
UPDATE: It actually sold 1.22m!
Bet with Teeqoz for 2 weeks of avatar and sig control that Super Mario Odyssey would ship more than 7m on its first 2 months. The game shipped 9.07m, so I won