Lots of good updates today for your iPhone and iPad, but Messages in iCloud is definitely something I’ve been looking forward to since it was announced last year. Better late than never.
Messages in iCloud is also now available as part of iOS 11.4. This feature lets you keep messages across devices in sync sort of like modern email. If you delete a message on one device, it will go away on all your devices. And if you set up a new device from scratch, your messages will appear without needing to do a full restore from an iCloud backup.
— Read on 9to5mac.com/2018/05/29/ios-11-4-airplay-2-homepod-stereo-messages-icloud/