Comcast's servers work with either protocol, so you'd need to check the program or app you are using to see which one is selected. See https://www.xfinity.com/support/articles/email-client-programs-with-xfinity-email.
I clicked edit under account and I have imap. Is that sufficient to get and receive email?
Yes. What client are you using? Outlook, Mac Mail, Thunderbird, Windows Mail10 or something else?