Good Afternoon Vikash.
With 'target delivery date ', I assume you mean the 'Date Required' column, in the 'General Information' section of the request?
As you probably will know, you can select/set which columns(fields) to be shown.
As in SC/Catalog/Configuration/Request Management Configuration (request)>Request General Information Column Configuration
And then, as to your question, this is a good candidate for an Idea in this same community.
To possibly get such functionality implemented and available, in a future release of the product.
Unless of course, there is some one else in the community, who has this implemented in 'some way'.
Thanks and kind regards, Louis van Amelsfort.