It is true that the announcement of the purchase was made earlier in the year. Of course, the information that goes into the models that develop the cost estimates need a source: cost per flying hour, fuel consumption rates and those sorts of considerations. This is in addition to the Canadian Armed Forces' own estimates of how much flying they'll do with the aircraft, the number of people who will be involved and all the other elements, including infrastructure and other considerations, to put together a Canadian-specific estimate.
On November 7th, 2023. See this statement in context.