The immigrants were deported from New Mexico, which means they were probably being held in the Artesia facility. (About 400 immigrants are currently being held at Artesia, though the government wants to increase capacity to 700.)
On June 26th, an ICE officer told the press that the goal of opening the Artesia facility was to deport families in ten to fifteen days. That was eighteen days ago — including the long July 4th weekend. So it looks like they're already up to pace.