Microsoft will stop releasing optional Windows cumulative updates starting in May 2020. This includes all supported Windows 10 and Windows Server versions. Microsoft emphasizes that this will not impact their monthly scheduled Patch Tuesday release on Patch Tuesday. This means that if a critical vulnerability is discovered, we would also continue to see out-of-band (OOB) security updates released. Microsoft also states that security will be their primary focus during the outbreak. This will continue as normal to ensure users are protected and can continue to be productive.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-pauses-optional-windows-cumulative-updates-starting-in-may/