Yes! As of version 1.2 of Metronaut, you can use the App with your bluetooth devices (speakers or headphones).
Be aware that if you use Bluetooth speakers or headphones, the cursor might be slightly desynchronised with the music. Fortunately you can adjust this latency manually.
If you see that the audio output is delayed with regards to the score on your bluetooth device (the cursor seems to be ahead of the music), drag up the score settings bar, go to the Performance tab and increase the latency value until the cursor is perfectly synchronised with the music.