It depends.  If you're using shell script or perl, you can definitely query
process and parse the output.  A simple example in ksh could be:

while dsmadmc -id=adminid -pa=password q pr | grep -i migrat ; do
   sleep 300
done

Or, if you want to rely on TSM RC's, which I've found to be occassionally
problematic,

while dsmadmc -id=adminid -pa=password q pr ; do
   sleep 10
done

I hope this helps.

Alex