If your COPR is issued after 18th March, 2020 you cannot travel to Canada unless you fall under an exemption list. Only applicants with a valid copr and prv dated 18th March or before can travel even if they don't fall in essential personnel list.No you can not without their approval. In the CoPR we received it is clearly mentioned '' NOT VALID FOR TRAVEL ''
I have raised a webform yesterday to inform them that I am ready to settle in Canada.
My agent advise me to book my flight and then to use ArriveCan to get their approval.
If anyone has more information, please feel free to share
Raising a ready to travel webform won't be of any use and please double check with the agent because if you are not an essential worker then you won't be exempted and are under travel ban.