He also added that based on the rapid developments in the manga's current "Wano Country Arc", he feels that the current pacing will allow for said five-year ending.
In an interview early this year, Oda revealed that One Piece will have over 100 volumes and back in July 2016, he revealed that the series was 65% done. As of October 2019, the series has 94 manga volumes.
[Source: Anime News Network]