SQL Server code can call just about any other code out there, .Net, batch files, powershell, so this is entirely doable. The problems are that you may need enable these features in SQL Server, also debugging t-sql or SSIS isn't a lot of fun. If I were given this task I would create a query to fetch the completed times of each job from the MSDB (sysjob, sysjobhistory tables) database in sql server. I would then have sharepoint fetch this data into a spreadsheet or list.
Here is a sample script to get you started.