It is not necessary for parents to undergo a medical examination or to be physically present in Canada in order to get super visa medical insurance; all that is needed is the completion of a medical questionnaire, if one is requested at the time of application. Its more beneficiary to start the super visa application process early as you may require to ask your parent grandparents about their health or even need to consult their family doctor to answer health questionnaire if required which gives you enough time to apply and understand the whole process.