List the 5 orders with the highest total price, indicating the delivery date.
order refers to o_orderkey; the highest total price refers to max(o_totalprice); delivery date refers to l_shipdate
SELECT T1.o_orderkey, T2.l_shipdate FROM orders AS T1 INNER JOIN lineitem AS T2 ON T1.o_orderkey = T2.l_orderkey ORDER BY T1.o_totalprice DESC LIMIT 5