This was reported on the Roscosmos page on Twitter.

“A meeting of the State Commission took place at Baikonur, where a decision was made to refuel the Soyuz-2.1b rocket and the launch time was 09:55:01 Moscow time.

At 06:25, the filling of the "package" (1st and 2nd stages) with kerosene began, "the message says.

Earlier it was reported that the Soyuz-2.1b launch vehicle will launch from the 31st site of the Baikonur cosmodrome in the morning of February 28.