It's not recommended, it's risk you are going to take, if Medicals are expired before your file is handled then you will have to do one more time. in my case, i am sure my file is handled in this year, so i did in july.
Finally got COPR after 23 months of waiting!!!!
DF : 06 décembre 2018
AR : 23 FEB 2019
Pre-arrival : 26 FEB 2020
MR JUN 3 2020 ( Up front medicals)
MR confirmed : July 15th 2020 ( Medicals confirmed)
DM - 28th Oct 2020
Copr - 3 Nov 2020
Inland applicant - family of 3 members.
Just now i got Pre-arrival services message. But i wondering why i got this email before MR and my timelines are
Application Sent Dec 6th 2018
AOR - FEB 26
I think nothing to worry. it may be part of security check to validate that you are still working with same employer. But how do you know that CIC called your employer ?