SQL & PL/SQL

Hello Experts
I haven't noticed much of a difference and i have looked at the execution plan as well but I might be missing something that I don't know yet.
I have a stored procedure with four delete statements. The tables are all related based on a foreign key relationship. Please see pseudo code below

CREATE OR REPLACE PROCEDURE test(
  empno_in     IN NUMBER
)
IS

BEGIN

delete from test1 p where p.id = empno_in;
delete from test1_child c where c.id = empno_in;
delete from test1_child_desc cd where cd.id = empno_in;
delete from test1_child_location cl where cl.id = empno_in;
commit;
end

Hence, my questions are as follows below;

1. should I only commit at the end, so is the best practice to commit after each delete statement transaction. Kindly note, I only committed at the end.