A suggestion for those having parents in Canada and waiting for PR approval process:
OHIP card requires the COPR document, foreign passport and a Canadian address proof document. I would advise to prepare the last document ahead of time. Easiest way is to apply for Ontario ID card or Drivers License. Also an option is to open a bank account or get a postpaid phone line.
With Ontario ID card and DL , you have to wait for 2-3 weeks for ID to arrive in mail.
With bank account or phone, you will have to wait for a month, as the Service Ontario folks ask for the monthly statement that gets mailed to your home
If you do this after you get COPR, there will be roughly a one month wait (or whatever time it takes you to get the address proof) to get the OHIP card.
My father had gotten DL, so he got the OHIP card right away. For my mom and mother-in-law, we now have to pursue one of the options