Yes absolutely, 24 hour airport pickup is very much available in Delhi and honestly it is something you should always pre book rather than relying on on-spot options at the airport.
Delhi airport operates round the clock and flights land at all hours including 2 AM and 4 AM. The on spot cab queues during those hours can be surprisingly long and surge pricing on apps like Ola and Uber during odd hours is very real.
Pre booking gives you a confirmed driver who is already waiting for you before you even land. Most reliable operators also track your flight so if there is a delay they adjust accordingly without you having to call and explain anything.
One important thing, always share your flight number and terminal details at the time of booking. T1, T2 and T3 are far apart and a mix up wastes a lot of time.
For groups especially, booking a tempo traveller airport pickup and drop in advance is the smartest move because it covers everyone in one vehicle with no last minute scrambling
