The 19-year conflict is also the United States' longest overseas military action, vexing three successive presidents.
The negotiations, the result of an agreement between Washington and the Taliban, are to begin in Doha after the release of the last half-dozen or so of 5,000 Taliban prisoners.
A source close to the process said the prisoner swap could be finished by today.
Abdullah Abdullah, a prominent politician and the chairman of the High Council for National Reconciliation said Afghan officials were ready to hold talks with the Taliban from early September.
President Ashraf Ghani said the council, announced late on Thursday, would "empower women", promote their rights at home and implement Afghanistan's international commitments on women's rights.