As of Version 2, here's what all levels/kingdoms the mod currently supports.
Cap Kingdom (fully completed)
Sand Kingdom (added more optimizations, almost completed, is included for testing purposes)
Lake Kingdom (partial support)
Wooded Kingdom (fully completed, added even more optimizations)
Cloud Kingdom (partially completed, added some optimizations)
Metro Kingdom (partial support) (Night time, daytime, underground areas, and festival)
Snow Kingdom (mostly finished) (Racetracks are also optimized)
Seaside Kingdom (partial support)
Ruined Kingdom (completed with subareas also supported)
Bowser's Kingdom (partial support)
Moon Kingdom (mostly finished)Darker Side (mostly finished)
Both the intro cutscene and the ending cutscene have recieved large optimizations as well.