Do you have an online tax account with CRA? If so, sign in there. You will see the NOA if it was produced.
What tax year are you working on? It must be 2018, if you just filed in November, so it should have been assessed by now.
There should also be a place there to 'change return'. It will either let you file it online, or tell you what you need to do.
If you don't have an online account with CRA, get one, it will make life easier. In the meantime, you could go to the tax website and search for the info needed. Sorry, I'm busy trying to d/l my stupid 2019 TT, which isn't working, so haven't got the website open.
