postgresql pg_replication_slots
PostgreSQL Replication Guide: Navigate Complexity | Airbyte
Guide to PostgreSQL Replication and CDC - Navigate the complexities of logical replication in PostgreSQL.
Logical Replication in PostgreSQL Using pglogical (Docker Setup)
There are at least couple of views that suits for verifying replication status: pg_replication_slots and pg_stat_replication.
PostgreSQL 12 Streaming Replication in Ubuntu 18.04 · GitHub
PostgreSQL 12 Streaming Replication in Ubuntu 18.04 - PostgreSQL-12-Streaming-Replication-in-Ubuntu-18.04.md