Today they will rest and take a short hike up a river valley to look at the south face and acclimatize. They will sleep at Confluencia tonight and get a pre-dawn start in the moring for the long 12 mile hike to Plaza de Mulas, 14,009' tomorrow.
Below are photos from other sources on the web, and are not a photo of them, but shows the type of terrain they travelled on yesterday, with Aconcagua in the background.