In the following install location, you can see that the time zones file contains the list of all supported time zones for Oracle except the four time zones of AFRICA_CAIRO, AFRICA_MONROVIA, EGYPT, and AMERICA_MONTREAL:

<Informatica installation directory>/services/shared/timezones/timezones.txt

If you want to add time zones later based on Oracle support for additional time zones, you can place a new file in the same install location that includes the new Time Zones.