It looks like there is no sort pipeline feature as of today, but there is an 'fly order-pipelines' command which can be used to specify the order for each pipeline.

According to the concourse documentation:

"Note that this command only ensures that the given pipelines are in the given order. If there are other pipelines that you haven't included in the command, they may appear in-between, before, or after the given set."

ex: fly --target target_name order-pipelines --pipeline pipeline_01 --pipeline pipeline_02