Oh thats nice, consider yourself lucky to have that option available
Looking on March spreadsheet SA took from few days to a month (like in our case). Hopefully you will get yours in few days (assuming they are still fast with that). By the way you can also track the progress using ecas (there you can see sponsor part, if you login using details of your sponsor):
https://services3.cic.gc.ca/ecas/authenticate.do (you can try it if you didnt up to now). If you see decision made on the sponsor's side, then in few days your sponsor will receive an email confirming that he/she is eligible to sponsor you.