The assessment report is actually produced according to the schedule of the reporting cycle. The emissions level for a particular milestone year would actually not be fully available until 18 months later. Therefore, the assessment report will actually be required when the national inventory for that particular year becomes available. There is a specific timeline to make sure that, with the release of the national inventory report for that year, the assessment report will also be released in a timely manner.
On June 7th, 2021. See this statement in context.