Manjaro uses systemd and you can interact with systemd services via systemctl. The SSH service is called sshd.service. So you can check its status with
Here are some more infos on security regarding SSH. The Mobian wiki is a good place to look for (more or less) PinePhone specific stuff in general.
Edit: Just saw you are using Plasma. Since Mobian uses Phosh, a lot of the stuff in the wiki might not be relevant for you. The SSH stuff still applies though since it has nothing to do with the desktop environment.
Code:
systemctl status sshd
Edit: Just saw you are using Plasma. Since Mobian uses Phosh, a lot of the stuff in the wiki might not be relevant for you. The SSH stuff still applies though since it has nothing to do with the desktop environment.