Unfortunately, it looks like the General and Custom shipping profiles that allow you to apply different rules for various shipping classes is independent of the section for processing time, (which seems to be a global setting that applies to all prod...

If you go to 'Settings' then 'Shipping and Delivery' and choose 'Expected Delivery Dates', there is a selection for Custom Processing Time that you can adjust as needed.  I tested it out and it changed the estimated delivery date customers see when t...

I think Shopify actually fixed this not too long ago without the need for an app.  If you go into the 'Shipping and Delivery Settings' and choose 'Expected Delivery Dates', there is a selection now for Custom Processing Time that you can set to any l...

You want us to add yet another monthly subscription fee just to adjust processing time? Additionally, the workaround you mention still creates a discrepancy between the delivery date the customer receives at checkout and any other notifications we po...