Heap Only Update

Hello Friends,
I am trying to find tables which Heap only update ratio less then 1 . Then
i will decrease fillfactor on these tables for more speedly update queries.

I am using this query to find hot ratio. For you , this method true or
false ?

select relname from pg_stat_user_tables where n_tup_upd>0 and
n_tup_hot_upd > 0 and n_tup_hot_upd/n_tup_upd::float < 1;

Thanks .
Best Regards.