The launch is expected at 6 PM but it will be finalised at the Mission Readiness Review (MRR) meeting on Sunday, a senior Indian Space Research Organisation official told PTI.
He said the process of integrating the satellites into the launcher is being carried out.
Officials said the Singapore spacecraft are "basically" earth observatory satellites with total mass weighing above 600 kgs.
"One TeLEOS weighing about 400 kgs, two satellites are 125 and 78 kgs respectively and rest are all in 12kgs range; they are for commercial purpose," the official added.
ISRO had last launched its latest communication satellite GSAT-15 successfully on board Arianespace rocket from the spaceport of Kourou in French Guiana on November 11.
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