Using that hypothetical timeline, I don't think a February or March 2024 date is out of the question. Both of those months have given us gigantic hits (adapted from already established IPs) before, like Black Panther, Deadpool, Captain Marvel, the Beauty and the Beast live action remake, The Hunger Games, etc. February of 24 seems to be kinda dead, with the only "major" films opening being a Dirty Dancing remake and Sony's Madame Web, both of which a hypothetical WW sequel with solid reviews and solid buzz would destroy at the box office. As for March, there's a whole lot more potential competition for WW3 (the Disney Snow White live-action remake with Gal Gadot as the Evil Queen and Rachel Zegler in the title role, Kung Fu Panda 4, a The Fall Guy movie remake, Godzilla V Kong 2 et al.) Then again, a February or March 2024 opening will probably interfere with postproduction. Who knows? December of 2024 will be a bloodbath for any film that dares open close to Avatar 3, although we have had multiple blockbusters make strong box office in December in the past...
August and September of 2024 are literally empty. I would take a calculated risk and open WW3 in mid August (3 weeks after the MCU's Thunderbolts opens, which is possibly enough time for it to have made all the box office it was going to make). This way, WW3 has 6 whole weeks to itself before Joker 2 and Deadpool 3 open in October and November. Plus August, traditionally a "dead" month for box office, has been extremely good for genre films (Suicide Sguad, Guardians of the Galaxy, Shang Chi, IT)