Itr prevalidation

Whether ITR processed?

If yes, when?

If refund awaited... what is its status under TIN?

Unless there is any communication from SBI for refund failure, do not do anything, but wait.

In some cases because of bank merger etc. It is taking very long for refund process.

No question of rectification, but in case you get refund failure notification, go for refund reissue with details of new bank account.

But wait for a week, you may get refund  by a week...