They were held for fishing illegally in Pakistani waters near Sir Creek.
Some 442 Indian fishermen who completed their prison sentences will be released in four batches. This is the first batch.
Another group of 100 fishermen will leave the prison Sep 2, a third batch of 101 prisoners on Sep 4, while the last group of 141 prisoners will leave Sep 6.
They were expected to leave the Malir prison for Lahore by road, Dawn reported. They are being released on the order of the federal government, it said.
According to the sources an NGO has provided buses to bring them to Lahore. They will cross the Wagah border checkpost Tuesday, Aug 31.
Earlier, the NGOs Pakistan Fisherfolk Forum and Pakistan Institute of Labour Education and Research had filed a petition in the Supreme Court for release of the fishermen.
On Aug 12, the court issued notices to the Foreign Affairs and Interior Ministries, asking them on what grounds the Indian fishermen were being held as they had completed their sentences.
The Foreign Ministry later told the court it had no objection to release the fishermen.
There are 456 Indian fishermen in Pakistani jails but the government ordered the release of 442. The fate of 14 other fishermen was not yet known.