That is an awfully long time to wait, specially when you submitted your application way before hand. But don't worry, after medical usually only good news follows.
As per the job change is concerned, I don't think you can tell them somehow, like there is no method of submitting any documents after you have submitted your application, is there? And since you you got your medical call so many days back, one can only assume that your background check and eligibility was cleared, so there is no need of telling about this when you have simply cleared all their 'checks'
Also, can you please the current status mentioned in front of of each individual row on your GC key account??