Thanks, very helpful!In your case the email might come a week before or maybe 2-3 days before the oath.
The instructions advise you to have your pr card with you during the ceremony as the card will be cut after the oath. For more information on the oath please check this post by @rajkamalmohanram
https://www.canadavisa.com/canada-immigration-discussion-board/threads/virtual-citizenship-ceremony-experience-in-detail.742497/