Source(August 2025): Monke read manga
All previous official dates have officially passed, until a new date is announce my best guess is mid 2030.
Source(August 2022): Interview between Eiichiro Oda & Gosho Aoyama in WSJ 34[Archive].
Oda's estimate for the end of One Piece: Second semester of 2025. Or maybe not.
Source (September 2020): Oda interview in arashi[Archive].

If you have a more up to date oficial end date, please let me know.