How to get a list of Apple Time Zones
macOS uses the same TimeZone layout as FreeBSD.
Look in /usr/share/zoneinfo for each time zone file.
ls /usr/share/zoneinfo
Africa          Australia       Etc             MET             WET
America         CET             Europe          MST             posixrules
Antarctica      CST6CDT         Factory         MST7MDT         zone.tab
Arctic          EET             GMT             PST8PDT
Asia            EST             HST             Pacific
Atlantic        EST5EDT         Indian          SystemV

Traverse the directories to drill down to the timezone you need.  Eg.  Eastern time would be:
/usr/share/zoneinfo/America/NewYork
The file is a C library.  To get the output of the file, you can use one of two commands - zdump or file:

zdump /usr/share/zoneinfo/America/New_York
file /usr/share/zoneinfo/America/New_York