Core question: is the port worth playing tonight, which edition to grab, and what to do before and after install so you do not waste a 24 GB download or miss launch bonuses.

1Decide Edition and Physical vs Digital

EditionWhat you get
Standard (~$70)Base game plus the Dark Knight Returns Batsuit if you pre-ordered.
Deluxe (~$90)Everything above plus the Legacy Collection (Arkham, Batman Beyond, party packs) and the Mayhem Collection at launch - playable Joker and Harley, Mayhem Mode, extra story mission, Sinister Pack. Owners on other platforms can buy a ~$25 Deluxe upgrade.
Physical DeluxeExclusive Retro Video Game Batman minifigure while stocks last. It matches an in-game purple pixel suit unlocked by finishing the Mimes story mission.
Physical is a Game-Key Card, not a full cartridge. You still download ~23.7-24.4 GB. Insert the card, connect to the internet once, then the card acts as the license.
Rule of thumb: Deluxe if you want Joker, Harley, and Mayhem Mode on day one. Physical Deluxe only if you specifically want the minifig. Otherwise digital Standard is enough for the story. Link a Warner Bros. account if you want the Golden Age Batsuit some pre-order listings mentioned.

2Install and First-Launch Checklist

3Settings Players Changed Immediately

4What to Play First

Common Mistakes to Avoid

If open-world hitching bothers you after an hour, wait for a possible patch - players already expect a later balanced mode. For tonight: bump camera to 5, grab Deluxe if you want Mayhem, keep 25 GB free.

Switch 2 First-Look Videos

First look at docked and handheld play
Gameplay overview with useful performance footage (Spanish audio)
Deluxe unboxing showing all included contents