I recently got my Amex Plat Travel and activated it in mid-Jan 25.
As per my experience, the 2K additional MR Points and the welcome bonus 10K MR Points both get credited by end-Jan 25 i.e. within a few days of the first transaction with my card. The same can be viewed in their Amex IN App.
Also, once you cross the annual milestones of Rs 1.9L and Rs 4L, half the points are credited automatically and for the balance MR Points, you need to call the customer care and they do it immediately.
All the MR Points activity can be seen in their app.
Hope this helps. 🙂