Here are the details about the system software currently on my Focus 3:
System Version: 3.0.999.302
Kernal Version: 4.19.81-perf-dirty
Build Number: QKQ1.210528.001 release-keys
Wave SDK Version: 4.2.1-u03
It says there is a system update to version 3.0.999.316 but it gets stuck at 0% when I try to do it from the headset or the Vive Manager app so I haven't been able to update to the absolute latest system version yet.