They should be taking off in the next hours. They have been on the ice for their 10 hour rest period, so when conditions are good enough they might go for it.
On the webcam images there is some activity going on, I can't make out what exactly.
Live webcam feed can be found here:
The USAP Portal: Science and Support in Antarctica - South Pole Station Webcams
Press releases from Kenn Borek can be found here:
NEWSROOM
Twitter feed with pictures of the plane on the ground/ice:
https://twitter.com/NSF_OPP/status/7...rc=twsrc%5Etfw