Congrats! It means they have received and completed reviewing your additional documents and finished reviewing your eligibility for a PR.
If it was positive
, you'll get an AIP letter within a week or two... and then they will review your security and criminality BGC, and upon successful completion, you'll get a DM letter followed by a Landing Interview Invitation.
Most people get their AIP and DM letters on the same day or within a week but some never get them. Your Landing Interview Invitation will depend on your local immigration office. Your fellow Hamiltonian
@Papo received his/hers 5 days after getting an AIP and DM letter. Unfortunately, for us, the Vancouverites, the wait time for our Landing Interview is up to 3 months after AIP and DM.
Good luck!