The final group of hostages to be freed under the initial deal is expected to emerge from Gaza later today.
For every Israeli citizen freed, three Palestinian prisoners held in Israeli jails are being released.
Early indications suggest the truce, which expires at midnight, could be extended.
Israel is offering a further day of pause in the fighting in Gaza for every ten captives released - and Hamas says it could agree to an extension.
A Palestinian official told the BBC between 20 to 40 additional Israeli hostages could be freed. Around 180 people remain in captivity, including about a dozen children.
In Gaza, the truce has allowed the delivery of much needed aid, as the humanitarian crisis triggered by weeks of unrelenting Israeli bombardment continues.
The Israeli prime minister, Benjamin Netanyahu, said he was open to extend the deal.
But he also stressed that after the truce, Israel would resume its offensive with the goal of eliminating Hamas.
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