rvictl works for me in Big Sur 11.0.1 (20B29) with Xcode 12.2 (12B45b) after I loaded rpmuxd as described here - https://developer.apple.com/documentation/network/recording_a_packet_trace/troubleshooting_packet_traces.
The path to rpmuxd's launchd plist may differ from the path in that article. I used this command to load it:
sudo launchctl load -w /Library/Apple/System/Library/LaunchDaemons/com.apple.rpmuxd.plist
csanchez3
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