Sorry to divert your question but… How did you avoid an “<insufficient privilege>” issue?

If this can be of any help, I have a total_time column not total_hours:

=> \d pg_stat_statements 
                    View "public.pg_stat_statements"
       Column        |       Type       | Collation | Nullable | Default 
---------------------+------------------+-----------+----------+---------
 userid              | oid              |           |          | 
 dbid                | oid              |           |          | 
 queryid             | bigint           |           |          | 
 query               | text             |           |          | 
 calls               | bigint           |           |          | 
 total_time          | double precision |           |          |