Walk-ins are available in certain offices since 3 weeks ago, but it's kind of a crapshoot, that's presumably why sonicbro was asking about the situation in passport offices in Ottawa.Congratulations!
I believe you can only apply in person for urgent requests by appointment only. They would require proof that you are going to a trip soon.
If it's not urgent, you have to mail your application.
https://www.canada.ca/en/immigration-refugees-citizenship/services/canadian-passports/new-adult-passport/apply-how.html