I haven't had time to try this yet. But it might be what you looking for.
https://www.nulledfrm.com/threads/pending-orders-to-prepare-picking-list.9291/
I did not recommend it. If you accually read my post you should be able to understand that my post is a copy & paste of whats new in version 2.6.0.
Take it easy!
This module works fine for me, so try that one
https://www.nulledfrm.com/threads/pdf-invoice-template-delivery-custom-number-module-v1-3-1-latest-by-globo.18839/
If you rely need 7.9.2 its here:
https://www.nulledfrm.com/threads/module-jpresta-speed-pack-7-9-2.36216/
Otherwise the latest version 7.9.11 is here
https://www.nulledfrm.com/threads/module-jpresta-speed-pack-7-9-11.41023/
I use Product Catalog (CSV, Excel) Import (by MyPrestaModules).
It works fine for me, but I haven't tried the cron function.
You'll find the module at
https://www.nulledfrm.com/threads/myprestamodules-product-catalog-csv-xlsx-import-6-5-3.37955/