According to videos posted today (11/28/23), you can take your fob inside with you while the truck is warming up. Unlike the new tundras, the truck engine will not stop when you open the truck door you will however, need to press the start engine button again. Note this will not restart the engine, but allow the truck to become drivable. The truck will not be drivable without the fob so, as it seems, theft will be unlikely.
According to videos posted today (11/28/23), you can take your fob inside with you while the truck is warming up. Unlike the new tundras, the truck engine will not stop when you open the truck door you will however, need to press the start engine button again. Note this will not restart the engine, but allow the truck to become drivable. The truck will not be drivable without the fob so, as it seems, theft will be unlikely.