The final legal challenge by Chan, 31, and Sukumaran, 34, who were ringleaders of the so-called "Bali Nine" heroin smuggling plot, was rejected nearly three weeks ago. The pair had sought judicial review of President Joko Widodo's refusal to show clemency.
Just one appeal remains to be concluded: that of the one Indonesian in the group, Zainal Abidin, whose lawyers have asked the Supreme Court to hear a judicial review application. The court is expected to hear it imminently.
Judicial review applications by Frenchman Serge Ataloui and Ghanaian Martin Anderson were rejected this week.
The only woman facing the firing squad, Filipina Mary Jane Veloso, was transferred to Nusakambangan early yesterday.
Indonesia previously said that would not happen until shortly before the executions, as the island is not set up for female prisoners.
On Thursday, Indonesian Attorney-General Muhammad Prasetyo sent letters to prosecutors in the 10 cases, instructing them to travel to Cilacap to start preparing for the executions.
And the last political obstacle has been removed, with the departure of foreign leaders attending the Asian African Conference in Jakarta.
Families of Chan and Sukumaran were reportedly travelling to Indonesia yesterday.