I logged in my IRCC portal and for the first time since I submitted?
It simply means that someone is working on your file and you may get an update on your profile in the coming days. You will be notified through your email when there will be new message in your profile which you can check after log in to your account. Depending on which stage your application is, you may be asked for additional documents, or it might be a passport request which means your application is approved. Hope this helps.