Tax return of [Personal Info Removed] was already sent and received by Intuit. Is it possible while it is not yet receive by IRS can I revised it adding 1099R?
No. You can hope that it rejects.
Hope for a reject on Feb 12 when IRS opens otherwise you're stuck having to amend once the 1040X is finalized, looks like its scheduled for 2/18.
You would have been better off holding the return instead of letting Intuit hold it for you. Now if it doesn’t get rejected Bob is going to need to file an amended return.
You should edit and Remove your client's name from this public internet forum, really.