You need to intiate a scheduling cycle. Addition of new nodes is known to the cluster, but the scheduler will come to know in the next scheduling cycle. Hence, you can try to run this command after adding the 3 execution nodes
qmgr -c “set server scheduling=t”
By initiating a scheduling cycle, qmgr -c ’ s s scheduling = t’
Yes, it would if all the pre-requisites are met on the new auto scaled nodes
hostname, dns, reverse dns, passwordless ssh
application , storage , scratch spaces are available.