you can create Query (table) with filter on agent version 4.8 a then create server task with the information from this Query.
In server task you can choose for example "apply tag or client task".
There is a lot of options
If you have more questions about this problematic. Please don't hesitate to contact me.
Thanks for the info! Based on query, then i can build a scheduler to tag system. Then run client task deployment with only the tag involved.