Two DNA polymerase molecules simultaneously work at the DNA fork, one on the leading strand and the other on the lagging strand.

DNA polymerase synthesizes each Okazaki fragment at lagging strand in 5′-3′ direction. As the replication fork opens further, new Pkazaki fragments appear. The first Okazaki fragment appears away from the replication fork and thus the direction of elongation would be away from replication fork.