Hi,
I think there isno option or way to find in quick way.
You can go to each process chain and see the logs view.
that may give idea, how frequently your chain was been scheduled.
If your chains were added at Tcode - RSPCM then you can check that t code - it may shows all scheduled chains.
Even use T code - ST13.
Even there are some other chains which are triggered based on client needs.
If your team was maintained a list which chains running on system then please check it.
Thanks