With regards to the certificate, yes. I did two things (1) I emailed them before the oath (using the email add they used to send me the citizenship ceremony invitation) and (2) Mentioned during registration (for the oath) that I had asked for urgent release of the certificate. They confirmed that they got my email.
In my case, I chose to pick the certificate up rather than be mailed to me.
Passport is another story altogether. There is urgent processing. The website will give you all the details you need. Please note that passport is being handled by a different department than the ones doing the Citizenship oath.
All the best.