Android - Treble: How do I check if it is enabled on my device?
Works on unrooted devices also
Install Termux and run
true if your device supports and
false if it doesn’t
adb shell getprop ro.treble.enabled
For users not familiar with terminal and such, Treble Check saves some hassle, and on top of that also offers info on whether the device has A/B system partitions (for seamless updates).