pg_replication_origin_status
   The pg_replication_origin_status view
   contains information about how far replay for a certain origin has
   progressed.  For more on replication origins
   see Chapter 50.
  
Table 52.81. pg_replication_origin_status Columns
Column Type Description  | 
|---|
        internal node identifier  | 
        external node identifier  | 
        The origin node's LSN up to which data has been replicated.  | 
        
       This node's LSN at which   |