Sites at Lackenby and Darlington are not affected and no job losses are planned.
Millions unable to do their job due to coronavirus will have their wages paid by a new scheme.
US President Donald Trump said he expects Saudi Arabia and Russia to strike a deal in the next few days.
More than 6.6 million Americans filed for unemployment last week as the coronavirus spreads.
The chain is the latest supermarket to reward staff for their extra efforts during the crisis.
At least 50,000 free weekly food parcels are to be sent out to clinically vulnerable people in England.
The airline says it is facing a challenging environment in “unprecedented circumstances”.
The department store is heading for another major restructuring which could involve more store closures.