Download all TESS Data Release Notes. The format of the files includes a sector number or range, a data release number ("drn??") that increases with every new Data Release Note and is thus a chronological indicator, and a version number ("v??") in case a given data release note needs to be replaced to fix something.
Note that for multi-sector data release notes, an additional file, called a "target info table", is included in text format. This file contains the set of TESS targets that were searched as part of multi-sector searches, and some additional information on each target's TCE and DV status as part of the run. See the header of the text files for more info.
For your convenience, the start and end times in both UTC and TESS Truncated Julian Date for each orbit in each Sector are provided in this CSV table.