Where we are:
On 1st January the EU started to apply checks on all goods from the UK coming into the Union.
However the UK decided to take a slower route to this, and planned that on the 1st April the UK we would be carrying out Sanitary & Phytosanitary paperwork for animal and plant EU imports like meat and eggs.
Then on 1 July we'd implement a full customs check on all goods arriving into the UK from EU member states.
Obviously we've struggled with exports as we weren't ready for this and its fucked business. But ultimately the import side of things has yet to hit the shit fan still.
It sounds like there is likely to be issues with imports of food in particular, so there is talk of delaying our plan of checks until later in the day. There is concern that the reopening of pubs and restuarants which will up demands of imports occuring at the same time as checks are put in place is likely to be 'problematic'.
Remember we get 2/3 of fruit, veg and cheese from the EU. And half our wine. And to date these largely have only been affected by haulage issues NOT UK customs issues...
You might want to keep that in mind.