Posting some relevant info found:
https://www.canadavisa.com/canada-immigration-discussion-board/threads/application-stages-what-they-mean-mep-ip1-ip2-ghost-update-version-2019.612656/
Post-submission stages:
False IP2 - Usually right from AOR or just after MEP. Background Check shows "We are processing your background check. We will send you a message if we need more information.”
MEP - Medicals passed: review of medical results changes from "You do not need a medical exam." to "You have passed the medical exam."
There is no email for MEP.
Ghost Update - When you log in, the application says it's been "
updated" but none of the fields have changed. Once you logout and log back in, the application returns to being "submitted". Ghost updates are not announced by email and a candidate must check their profile daily to not miss them.
Ghost Update #1 or Real IP1 - "In progress" 1: Background Check changes to "Your application is in progress. We will send you a message when we start your background check." Usually follows MEP. Some applicants (especially Inland and CEC) skip this stage.
You should receive an email for your Real IP1 - the email will not provide any details, just that your application has been updated.
NA2 - "Not Applicable" 2: Background Check changes to "Not Applicable" again after IP1. Some applicants skip this stage and it is easily missed.
No email.
Ghost Update #2 or Real IP2 - "In progress" 2: Background Check changes to "We are processing your background check. We will send you a message if we need more information."
No email.
NA3 - "Not Applicable" 3: Background Check changes to "Not Applicable" again after IP2 (uncommon).
Ghost Update #3 or Final Ghost Update - Often considered a sign that PPR is coming soon. Not seen by all applicants.
PPR - Passport request: IRCC sends "Ready for visa" e-mail asking you to submit your documents to your visa office so they can issue your CoPR and entry visa if applicable. A PPR is announced
only by email, and there may be no changes made directly to the profile. If you are worried you might miss it, you can whitelist the email domain
@cic.gc.ca to ensure the email comes straight to your inbox.
CoPR - Confirmation of Permanent Residence: A document that says you've been approved for permanent residence.
Other notes:
1. The ‘eligibility’ and ‘final decision’ fields in your profile will not change to passed until after you receive your CoPR.
This is an example of what a profile may look like following a CoPR.
2. Remember that these are not "official" stages, but they are used frequently throughout the forum to track the processing of applications.
