Once you have completed your online eTA and submitted and paid for it, you should receive a
confirmation email that it has been submitted, along with a unique reference number for your
application. If you want to check the status of your application then you can do so on the website
using the reference number.
It usually takes minutes for an eTA to get processed but sometimes it can take longer, so travellers
are advised to apply for their eTA at least one week before they are due to fly to Canada, just in
case there are any delays or issues with the application.
You can check the status of your eTA even to see whether it is still valid, as you can use it
multiple times throughout the five years of validity, provided your passport is still the same one
you applied for eTA with.