Cows will still need milked and unless we plan to pour it down the drain the milk will still need processed, then you have NHS workers and so on, I suspect it will only be non essential work that will be put on hold.
The whole thing is BS, people who are at a high risk of death from this virus need to self isolate, the rest of us will experience nothing more than a mild cold and unless our jobs involve coming into contact with those high risk people then we have no real reason to stop working and continuing on as normal.