Understandably, Microsoft has made the difficult decision to delay the release of SQL Server cumulative updates (as well as updates for other products) by about a month, as outlined in a recent update to Lifecycle changes to end of support and servicing dates.
- SQL Server 2019: Cumulative Update #5
will ship in Juneshipped June 22nd - SQL Server 2017: Cumulative Update #21
will ship in Julyshipped July 1st - SQL Server 2016: Service Pack 2 Cumulative Update #13
will ship in Juneshipped May 28th