Retail chains like VinMart and Co.opMart will operate from 7 a.m. to 5 p.m. instead of 10 p.m.
Big C outlets will open 1.5 hours earlier at 7 a.m. and close at 5 p.m. Aeon Malls and Mega Market will also apply the same hours.
Most supermarkets in the city had shelves full of eggs, meat and vegetables Monday, with no sign of stockpiling.
Retail chains have been doubling or tripling their supply to fulfill demand. They also have delivery staff ready in case delivery platforms are banned.
HCMC banned people from leaving their homes except for emergencies after 6 p.m. starting Monday.
This is the latest effort to curb the spread of the fourth wave of Covid-19, in which over 62,100 cases have been confirmed in the city out of 97,400 nationwide.