No predictions loaded for 2039. This site serves NOAA predictions from its own store, and this period has not been fetched for Boston yet. Nothing is estimated or interpolated in its place. NOAA's own page for the station has the official table: tidesandcurrents.noaa.gov.
tidealmanac.site/us/ma/boston-8443970/2039
Boston, MA tide table 2039 (printable) · Tide Almanac