The V.P. selection process draws to a close.

WILMINGTON, Del. — Mr. Biden has told allies that he has interviewed every finalist in his vice-presidential search, and his advisers are planning an announcement for the middle of the week, people briefed on the selection process said on Monday.

In a sign that the choice is now in Mr. Biden’s hands alone, the four-member committee that screened his potential running mates is said to have effectively disbanded — its work is complete, Biden allies said, and there is little left to do except for Mr. Biden to make up his mind.

The former vice president, however, has not been known for his punctuality so far in the presidential race, and the timeline could well slip again.

Mr. Biden has spoken with the vice-presidential candidates through a combination of in-person sessions and remote meetings over the last few weeks, but the exact timing and circumstances of all of the meetings are not clear. Close advisers to Mr. Biden said he had been directly in touch with all of the leading candidates.

Some of the strongest contenders have been Senator Kamala Harris of California; Susan E. Rice, the former national security adviser; Senator Elizabeth Warren of Massachusetts; and Gov. Gretchen Whitmer of Michigan, who met with Mr. Biden on Aug. 2. Mr. Biden and his team have also closely considered Senator Tammy Duckworth of Illinois, Gov. Michelle Lujan Grisham of New Mexico and Representatives Karen Bass of California and Val Demings of Florida.