I would wrap when color is just a little lighter than the finished product you want. Add a little apple juice to the foil, maybe 1/4 cup, then fold up and hit the spurs. 375F and you can make it. Remember to rest it, unwrapped, for 15 to 20 minutes, then wrap and rest until time to pull and serve.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"perhaps...but then again...maybe not..."