Not totally sure I understand your question, but if you're wondering how to get the data from your stored procedure into Excel, it's pretty easy.
Go to Data tab, Get Data, from SQL Server.
Then you get Server, Database, and there's an "Advanced Options" part - click the down arrow thing. A textbox will appear... Copy & Paste the T-SQL statement there. Could be EXEC storedProc param1... or a query. Run and it will pull the data returned into Excel for you, and then you can graph it.