In your Plenty shop (LTS), you now have the option to show or hide shipping profiles in the checkout based on the cut-off time.

The settings for showing or hiding cut-off times for a shipping point can be found in the menu Setup » Shipping » Shipping service providers » GLS ShipIT » Shipping settings. These settings are used for all shipping combinations for which this shipping point is enabled (provided the cut-off times are not excluded by the regions selected there).