Hi Chris - This is right. Once you update your security group with the 8888 port set to open as you have above, the instance will be able to receive and send on port 8888. Then run the previous commands I listed - AWS AMI available for testing and it should allow you to access the Jupyter notebook via the browser.
http://<ec2 address>:8888
Make sure you run jupyter notebook inside a tmux session. That way the notebook keeps running even if your ssh session gets disconnected.