If your application is progressing, you will not receive a lot of news about it. Expect your medicals to change to "passed" at some point, and background check to "in progress". The next step is already PPR (or request for RPRF if you haven't paid it already).
You will typically receive an update email 24h after the update is visible in myCIC. You will also receive an email if there is correspondence waiting for you in myCIC.
Many people also receive update emails when nothing in myCIC has changed. This is what forum members call a "ghost email". I have never received one of those.
The common interpretation is that this means someone has touched your profile, but I don't think there is sufficient evidence for that. I might just be funny quirks in their IT system.
By all means, a lack of these ghost emails doesn't mean that no one is working on your profile. Like I said, I never received one and my processing time is dead bang within the 6 month window.
A lot of people also spend a lot of time comparing timelines, and many get upset when they supposedly fall behind. There are so many individual factors that it makes no sense to do so - it will only stress people out.
I just stopped checking this forum for 4-5 months or so and only logged back in as I was approaching the six months. Highly recommend this for sanity and peace of mind.