I am also in the same boat. We received medical instructions on April 26th and got it done on May 5th. Now, my concern is if they do not update medical results before May 26th (30th day of receiving the medical instruction), are they going to consider this as 'late' submission of required information? Because it says in the instruction letter that 'we may refuse your application if medical is not done within 30 days of receiving this letter'.
Do they know we have done our medical and results are not updated from their end? We have proof of medical examination (eMedical form) but it will be required only if IRCC creates fuzz about it.