The main estimates were tabled on March 1, as per the Standing Orders of the House of Commons. As you know, the budget was tabled at the end of March.
Having said that, if you look carefully in the supplementary estimates (A), you will see all of the budget 2023 items that have already been included in the supplementary estimates (A). You will see, for those items, a reference to the budget. There is a tagging of what is included in supplementary estimates (A) that relates to budget 2023.
As the PBO stated in his report, which was tabled on Monday morning, more than 40% of the items from the federal budget are already included in supplementary estimates (A).