You can use SET STATISTICS TIME ON, but it would return you timing for all single queries inside of your stored procedure. If you have bunch of queries inside then it might be not really convenient. Here is a little code snippet alternative to STATISTICS TIME:
Declare @d datetime
Set @d = CURRENT_TIMESTAMP
-- Your stored procedure call goes here
Use DBCC DROPCLEANBUFFERS to clear sql server cache for cache independent time measurement.