Try this command, and we show example output as well:
systemctl list-units --type=service --state=running UNIT LOAD ACTIVE SUB DESCRIPTION auditd.service loaded active running Security Auditing Service chronyd.service loaded active running NTP client/server crond.service loaded active running Command Scheduler dbus.service loaded active running D-Bus System Message Bus [email protected] loaded active running Getty on tty1 haproxy.service loaded active running HAProxy Load Balancer irqbalance.service loaded active running irqbalance daemon lvm2-lvmetad.service loaded active running LVM2 metadata daemon NetworkManager.service loaded active running Network Manager polkit.service loaded active running Authorization Manager postfix.service loaded active running Postfix Mail Transport Agent rsyslog.service loaded active running System Logging Service snmpd.service loaded active running Simple Network Management Protocol (SNMP) Daemon. squid.service loaded active running Squid caching proxy sshd.service loaded active running OpenSSH server daemon systemd-journald.service loaded active running Journal Service systemd-logind.service loaded active running Login Service systemd-udevd.service loaded active running udev Kernel Device Manager tuned.service loaded active running Dynamic System Tuning Daemon xl2tpd.service loaded active running Level 2 Tunnel Protocol Daemon (L2TP)