This will return all the details you want to know

select * from information_schema.triggers

or if you want to sort the results of a specific table then you can try

SELECT event_object_table
FROM  information_schema.triggers
WHERE event_object_table = 'tableName'
ORDER BY event_object_table

the following will return table name that has a trigger

select relname as table_with_trigger
from pg_class
where pg_class.oid in (
        select tgrelid
        from pg_trigger
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