Yes, you can certainly wrap your brisket if you notice that it has reached a stall. This can help it break through the stall and get back on track. Many people choose to wrap their brisket from the get-go.
This is thought by many to stop the stall from happening in the first place, or at least shortening the amount of time it can stall for. It is worth bearing in mind that if you like a crispy bark on your brisket then wrapping the brisket may interfere with this.
For this reason, you may want to finish it off by unwrapping it when it is almost done. Likewise, wrapping it at the stall when it has already started to crisp may work well.