It all depends upon his immunity and all the risk factors like his DDimer/iL6/Ldh/
crp . He is having history of Copd and
diabetes ( co morbidities) which makes recovery slower as compared to normal individuals.
Let the doctors try their level best and pray.
Hope he recovers soon.
Next Steps
he must be in a proper icu setup it seems.
continue the treatment as he is taking and have faith.