I feel like Ant-Man and the Wasp is the best comparable option when it comes to Spider-Verse. Both are superhero movies, both have a strong fanboy crowd, but both will also have a pretty strong family crowd to balance things out.
Using both movies' Monday Fandango sales, Spider-Verse has sold 56% of AM&TW at the same day, which would translate to about 42.5M. Of course, sales could be spread out more due to the Christmas season (even though only two theaters have Chirstmas Day showtimes up for Spider-Verse), and maybe Spider-Verse skews more fanboy or more family than Ant-Man, but that OW isn't all that impossible at this point.