I have had several packages sent from the UK, from multiple users, simply not turn up.
This week i placed an order with COMC, and their estimated delivery date was September 10th!!
I'm not sure if the issue is their warehouses are closed to pack new orders, or if the quarantine is creating delays in the delivery timeframes as packages "wait" to clear that quarantine period. Maybe both.
I ordered some tennis cards via ebay in late March, and they arrived Mid-May.
Summary - delivery timeframes are LONG at the moment. It is what it is.