Update: Samsung has started rolling out the One UI 2.0 for the Galaxy A8s (aka Galaxy A9 Pro 2019). It comes with the March 2020 security patch. The software version of this update is G8870ZCU3CTB2.
Samsung is rolling out the Android 10-based One UI 2.0 update to the Galaxy M40 smartphone in India. The update comes with software version M405FDDU2BTB5.
The company has already released the One UI 2.0 update for the Galaxy M20 and Galaxy M30 smartphones. The latest update includes many new features and improvements. It also adds the March 2020 security patch. The size of this update is more than 1700MB.
If you want to check for the update manually, just head into the device Settings then tap on the Software update menu and go for the Download and install option.