Yesterday I did the same and came across the way you showed it didn’t work. What did work for me was (as mentioned in another thread by a/the developer):
ssh <remote host> "/opt/vyatta/bin/vyatta-op-cmd-wrapper show vrrp"
Name Interface VRID State Priority Last Transition
------ ----------- ------ ------- ---------- -----------------
int eth1 1 MASTER 200 6h53m
public eth0 102 MASTER 200 6h53m