Loads of posts with answers on here. S24 series update is rolling out now. If you have a network provider phone, it may take a bit longer for the network provider to get the software out
But as you have imported the phone to another region You won't get the over the air updates Try connecting to a computer and using smartswitch on the computer to check for available updates
Hey there and welcome to the Samsung UK and EU Community Customer to Customer Forum
As you have a device that is "out of region" you will likely need to wait until the India rollout has commenced and then you may / may not receive an Over The Air update.
If this is the case, connect your phone to a laptop or computer and use SmartSwitch to see if an update is available.