No unfortunately not. The only possible solution i have heard was to ‘disconnect’ temporarily the connection between the Google Merchant Center and Shopify. We disconnect from both sides and adjusted the processing and delivering dates, but after reconnecting the API-feed get transferred from Shopify to the Google Merchant Center again, and the processing and delivery dates getting VERY LONG again (4 - 12 days). Also within Shopify we cannot find or change anything of dates (the place where it should stand is not editable / light grey).
So it seems no one in the World knows how to fix this problem… -_-’