The virus needs living cells to replicate. At death, cells start dying. How long it takes for all cells of mucous membranes and lungs (sites most likely to spread virus) to die is not known.
It is unfortunate that panic about this virus creates bad situations when comes to burial.
In India a prominent doctor died of Covid-19 after caring for patients. Local villagers blocked access to cemetary so his casket could not be interred fearing they would be infected. The casket itself would not be infectious and body locked inside could not spread disease.
Police said people living near the cemetery feared that burying people who died from COVID-19 would spread the virus. Dr Simon Hercules was finally laid to rest by a friend the next day.
www.asianews.it
The same thing happened in Egypt.
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It is proper to be very careful handling body of recently deceased person. But nothing infectious about a body sealed in coffin. Education and information are needed to help communities understand.
During Ebola, they didn't have coffins or caskets to bury bodies of victims of infections. So corpses were burned to prevent spread of very deadly virus.