Well, wait, we do. Well...maybe. Because Jacob was dead—according to Jacob—and the healing spring was dirty, which was likely associated with Jacob's death. And Sayid may or may not be possessed by Jacob. So...there are a number of Jacob-related cues that point to their being back on the regular timeline, but I wouldn't discount the possibility of their being behind or ahead of Ben and the rest.
Additionally, Cindy told the other Templars that our Losties were on the "first plane." The second would be Ajira 316. (I don't think she's counting Yemi's plane because that crashed before 815 did).
My recaps are up. If you just want to reader a shorter summary, you can click the link to the recaplet on the first page of each one.
6-1: [link]
6-2: [link]