Among the products with an average lead time of 60, which vendor has the highest profit on net? Indicate the credit rating of such vendor.
profit on net = SUBTRACT(LastReceiptCost, StandardPrice);
SELECT T2.Name, T2.CreditRating FROM ProductVendor AS T1 INNER JOIN Vendor AS T2 ON T1.BusinessEntityID = T2.BusinessEntityID WHERE T1.AverageLeadTime = 60 ORDER BY T1.LastReceiptCost - T1.StandardPrice DESC LIMIT 1