How to trigger a snaplogic pipeline. based on schedule completion in mainframes

Right now we are using SLIM to transfer the files from mainframes to S3 bucket to trigger the snaplogic pipelines manually upon the completion of mainframe schedule

Hi , I have a requirement to trigger a set of pipelines based on the files availability from a mainframe batch cycle automatically.
In short.

1. Mainframe schedule that runs on demand /monthly and places few files for snaplogic .
2. Once the mainframe schedule is completed the snaplogic pipelines should trigger automatically.