I am not sure what visitor visas look like but it would be a number printed on whatever document you have, I assume. If you already have an online account, it may be accessible there. Unfortunately I only know what a work permit document looks like - it's listed in the righthand corner.
Congrats!
You're within the average processing at the moment. People from the first week of September are starting to get their AORs and it's a little slower than it was for people in August.
If you want to add/track your information, there's a spreadsheet:
https://docs.google.com/spreadsheets/d/1Gm315tmNKWoywb7PwZBiE67fUmznYQrNhYVWXPXXJBw/edit#gid=1021088134
This helps people figure out what the average is, more or less.