The east grand canyon entrance is now open: https://www.nps.gov/grca/planyourvisit/conditions.htm

If you take hwy 64 west from hwy 89 it's about 30 minutes to Desert View Watchtower or Navajo Point, so about an hour drive detour.

Are you planning to make this trip in one day? That's about 13 hours with no stops or detours, if you broke it up in two days you'd have a lot more time to explore along the way.