The output you have provided is as folows :-
Cluster ID: 1
Node Priority Status Preempt Manual failover
Redundancy group: 0 , Failover count: 2
node0 255 primary no yes
node1 100 secondary no yes
Redundancy group: 1 , Failover count: 4
node0 200 secondary no no
node1 100 primary no no
RG0 is the routing engine which is active on node 0.
RG1 is the dataplane which would actually pass the traffic and is active on node 1.
So in such a scenario, all the traffic is being handled in RG1 i.e. on node 1.
It would be forwarded through the node 1 member interfaces of the corresponding reths.
There would be no issue in passing traffic in such a scenario through the SRX.
Hope this helps.
Regards,
Sahil Sharma