Transitioning to the T+1 settlement mechanism system

Zerodha
2

Is there any official documentation for reference?

Official documentation of what?
Here are a couple of them on the T+1 settlement-cycle announcements.

  • [SEBI circular] In Sep 2021, SEBI announced the migration in phases to a T+1 settlement cycle.
  • [NSE Press Release] NSE and BSE have published their timeline for the same as well.

Currently, late 2022 / early 2023 appears to be the ETA for all the scrips to be operating on a T+1 settlement-cycle.

And anyone with any updates?

Here’s a status update with the list of scrips that have transitioned to a T+1 settlement-cycle.
(found it on another post in TradingQnA; presumably published/maintained by Zerodha.)

For more details, checkout this post.