Yes — Carson Wentz is the Vikings' starting QB right now and it'll stay that way for Week 2 unless Kyler Murray clears concussion protocol in a hurry.
Here's what happened: In Week 1 against the Packers, Kyler Murray suffered a concussion in the first quarter. Wentz stepped in cold and led a 29-unanswered-point rally — going 12-of-19 for 133 yards and 3 TDs (2 to Justin Jefferson, 1 to T.J. Hockenson) with a 123.5 passer rating in a 39-22 win. It was only the second time in Super Bowl era history a QB threw 3 TDs off the bench in a season opener. (From the Carson Wentz page)
Murray remains in the concussion protocol, and his status for Week 2 is uncertain — the Vikings face the Bears on the road this week. Unless Murray gets cleared in the next few days, Wentz will be under center again.
From a fantasy perspective, Wentz is a premium streaming play with Justin Jefferson, Jordan Addison, and T.J. Hockenson at his disposal. On Underdog Fantasy Football, Josh & Hayden put it simply: "Carson Wentz is now the starting quarterback of the Minnesota Vikings... Kyler Murray is in the concussion protocol."