WASHINGTON — The new attorney general, William P. Barr, is preparing for the special counsel to deliver a report in coming weeks on the results of the investigation into Russian interference in the 2016 election, two officials briefed on the Justice Department’s preparations said.

President Trump’s legal team and other allies of the administration have incorrectly predicted an imminent end to the investigation by the special counsel, Robert S. Mueller III, for well over a year. It remains unclear whether Mr. Mueller might take further public action, such as additional indictments, before submitting his report to Mr. Barr.

Once the report is submitted, it is not certain how much of it will become public or when.

The submission of a report by Mr. Mueller would effectively mean his office is closing down. The special counsel would no longer be conducting investigations in conjunction with the F.B.I., and Mr. Mueller would not be opening any new lines of inquiry.

But active cases that have not yet been brought to a conclusion would likely continue. New prosecutors from outside the special counsel’s operation could pick up cases that remain in progress. And some cases that spun off from Mr. Mueller’s investigation — including those being conducted by the United States attorney’s office in Manhattan involving Michael D. Cohen and Mr. Trump’s business — would continue unaffected.