Security only starts after IRCC sends a request to the National Security Screening Division (NSSD) and screening partners. IF you have been assigned to a group, then your security may not have been initiated. If it starts, then you will see a note under admissibilities -> Security in your GCMS notes.
Many applications hav been placed on hold were eligibility is passed and security has not yet been initiated.
To read in security, how long ti takes and how it is done, see
https://bit.ly/30dmJOz