Do you really need fractional seconds?

Copy SQL

WITH all_defaults AS (SELECT c.table_schema, c.table_name, c.column_name,  c.data_type, c.domain_schema, c.domain_name, coalesce(c.column_default, domain_default) AS default_value,
CASE WHEN c.column_default IS NOT NULL THEN 'Column default' ELSE 'Domain default' END AS default_type
FROM information_schema.columns AS c LEFT JOIN information_schema.domains d USING (domain_schema, domain_name)
WHERE c.table_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL) 
AND (column_default IS NOT NULL OR domain_default IS NOT NULL))
SELECT table_schema,  table_name, column_name, data_type, domain_schema, domain_name, default_value, default_type
FROM all_defaults
WHERE default_value~*'(localtimestamp|current_timestamp|localtime|current_time|now[(][)])$'
ORDER BY table_schema, table_name, column_name;