I have asked ONIP when can I update my information while my application in process ..
and here's ONIP response
"You may wait to receive an Acknowledgement letter which includes your application file number to provide your most recent information e.g. employment and passport. As required, please provide the information including the change of personal information form.
If your application is incomplete, your package will be returned to you by Purolator including the payment.
Please note that if you are in Canada, it is your responsibility to remain in legal status throughout the time while your application is being processed by our program.
Thank you for your interest in our program."