So Marine Depot should surely be providing you with an update, not GHL, who would surely batch ship to the retailer, unless they ask GHL to ship separately at additional shipping cost, or are they back to backing orders and asking GHL to direct ship?
If it helps, I had a 6 week delay in shipping from Germany, not due to GHL or the LFS, but a combination of Brexit, carriers dumping consignments at the border and the fact that Germany is in a heavy state of lockdown in many places.
Having been an Apex user and Neptune customer for 7 years, I’d be patient. The GHL is a far better system, built by grown-ups.