When the decision envelope for a visa application is dispatched from the IRCC (Immigration, Refugees & Citizenship Canada) Office to the Canada Visa Application Centre in CVO, it means that the envelope containing the letter with the result of your visa application has been sent from the IRCC Office to the Canadian visa application centre [1].

This step indicates that a decision has been made on your visa application and the result is enclosed in the decision envelope. The decision could be either an approval or a denial of your visa application. Once the decision envelope arrives at the Canada Visa Application Centre, you will be able to collect it and see the outcome of your visa application [1].

Learn more:

1. The decision envelope for your application, tracking ID No ...
2. What does this mean? | Canada Immigration Forum
3. Canada Visa VFS Global Email Update Messages Meaning - Canada