As of October 7th, 2019 Apple's macOS Catalina is available to download. Here are some of the newest features include:
At the writing of this posts I'm in the process of upgrading my iMac to Catalina to test one of what I feel will be the greatest features to increase productivity; Sidecar.
It's somewhat surprisingly that Apple hasn't introduced this feature in the past but the ability to use an iPad as a secondary display is something that I feel has been an overlooked feature for far to long. Per the Sidecar Tech Brief there are some limitation on what hardware and devices will be supported.
Here is the current Sidecar-supported Mac Models:
Sidecar-supported iPad models:
For my test I will be using a Late 2015 iMac with a 12.9-inch iPad pro and will make sure to provide an update on my overall impression of the practical usage of Sidecar and if it's worth the hype. Stay tuned!