My brother in law died this morning Cancer patient. But Died of Pneumonia. Can we delay burial one day till tomorrow afternoon. Until all family gather? Dr say he was on chemo and burial Asap should be

Wait for family . Tomorrow counts as ASAP. It will be better for the family and closure for all. .
Would seem so... I am sorry to hear of your loss. Without a lot of details I would have to say that funerals and burials are often/usually planned for several days after death. One day should not make a difference. Discuss with the funeral director.
Time of burial. The family can choose the date of the burial. Delaying it a day would be of no consequence.