-- Last pg config reload time

postgres=# select pg_conf_load_time() ;
pg_conf_load_time
----------------------------------
2020-07-06 13:20:18.048689+05:30
(1 row)

-- Reload again and see whether reload time changed or not

postgres=# select pg_reload_conf();
pg_reload_conf
----------------
t
(1 row)

postgres=# select pg_conf_load_time() ;