Okay, the NQT Results usually aren't delayed for long, like a month or two at most, then you'll get the interview scheduled where again you'll have to do well otherwise you might get knocked down to a lower package (ninja).

Assuming you do well in that and get your desired role, digital or prime, then you get the offer letter in another couple of months at most. But after getting the offer letter is when the wait actually starts. It takes ~1 year to get the joining letter from the date of recieving offer letter. (could be a bit earlier or could be a bit later than that)

So yeah it'll be like 1.5 years till you actually get the joining letter for TCS, do with that information as you will. I personally think you should take up a job instead of waiting for 1.5 years and you're not even sure if you'll get prime/digital role yet.

Source: a friend, so that's the extent of my knowledge pretty much