WRS is specifically designed to be used interactively via browser, so it is not the right place to look for scheduled actions.
Take the logic of the stored process(es), and run them in batch mode, scheduled by whatever scheduling system your organisation uses. Create files (if you need reports, ODS TAGSETS.EXCELXP is one fine friend), and store them in a location that is accessible by endusers.
Ask if the users actually need Excel files, or if the data is more important than the packaging. HTML pages can contain links to .csv or other file types for download.
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