It supports only 2CA on B40+40, 41+41. Airtel CA depends on the cell site, if CA enabled on tower u will get 20-40mbps and on non peak hours more than 50mbps possible.
After few months I have recharged my JIO sim and now seeing drastic improvement in speed here earlier used to get less than 5 Mbps now 50+ that too in the evening time. Also now getting JIO 4G+ in my area.