Howdy howdy! Sandy blowing some winds our way tonight! Ugh, it was a wet, windy day out there today.
From what I have observed, "medicals received" is no longer a sign of impending finalization of a file. It USED TO BE. About 2 years ago when I first came to this forum, it was the case that KG would request the medicals as the final step and seeing "medicals received" on eCAS was a sure-fire sign you were in the PPR stage. That is no longer the case, as apparently CPC-M is now responsible for uploading the medicals.
When your application is received at CPC-M, it says "application received". It will change to "decision made" when the sponsor is approved. There is no "in process" stage here, as this is a simple check to make sure the sponsor meets the eligibility criteria and there is a completed application which will be sent to the VO. You MAY see "medicals received" at this stage.
When your file gets to KG, your spouse's section of eCAS will switch over to "application received" once the application is uploaded and the file created by KG. If you did not see "medicals received" soon after or concurrently with the sponsor's approval, you may now see "medicals received". From there, it MAY move to "in process" to signal it is close to finalization. I say "may" because this is not guaranteed. In some cases, it may simply go to "decision made" from "application received" and your spouse is contacted for PPR and the other finalization steps.