If it's not vacu-sealed or in a an airtight bag already I would recommend getting it into an airtight container asap. Grains (like bread) can go stale if left open to air and moisture too long. You also risk pests like weevils, mice etc getting into your grains if it's left out.
Get it all sealed up then placed somewhere dry and cool (and safe from vermin) until you get the chance to use it.