I can easily find all the tables of the form
select * from pg_tables where tablename like '_%_jobs'
select * from pg_tables where tablename like '_%_jobs' having count(*) > 200000
ERROR: column "pg_tables.schemaname" must appear in the GROUP BY clause or be used in an aggregate function
SELECT relname, reltuples from pg_class where relname like '_%_jobs'
There maybe slight discrepancies between the numbers reported here and actual. From the manual section on reltuples:
Number of rows in the table. This is only an estimate used by the planner. It is updated by VACUUM, ANALYZE, and a few DDL commands such as CREATE INDEX.