Para comprobar si la réplica se está realizando podemos lanzar la siguiente consulta SQL en el nodo primario.
select client_addr, state, sent_location, write_location, flush_location, replay_location from pg_stat_replication;
Si la réplica se está ejecutando, veremos una salida como la siguiente:
postgres=# select client_addr, state, sent_location, write_location,
postgres-# flush_location, replay_location from pg_stat_replication;
client_addr | state | sent_location | write_location | flush_location | replay_location
--------------+-----------+---------------+----------------+----------------+-----------------
192.168.1.68 | streaming | 0/17001AA0 | 0/17001AA0 | 0/17001AA0 | 0/17001AA0
(1 fila)
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