How to give 0 at the beginning of hour or giving AM and PM in postgresql

Question

I'm trying to GROUP_BY hour using this query:

SELECT count(message) AS total_pesan,
   h.h as hour
FROM generate_series(0, 23) AS h
   LEFT JOIN tasklist AS r
      ON extract(hour from r.create_date) = h.h
         AND r.create_date >= '2022-06-07 00:00:00'
         AND r.create_date < '2022-06-08 00:00:00'


     
    inner join telco_prefix on 
        substring(r.msisdn, 1, 4) = telco_prefix.prefix and telco_prefix.telco_id  = 1 where r.user_id is not null 
GROUP BY h.h
ORDER BY h.h;

it worked just fine but only one problem that is, it doen't have hour format like AM and PM or like 01 - 23

it only show like this:

result of the query