I am not someone who puts super high value on drafting WR high, esp when you have a #1 already. There are always guys drafted lower who are successful. The Steelers have made a living off drafting very good WRs in the second and later, and really most of the best WRs weren't drafted in the top 15. Jefferson, Lamb, Metcalf, Borwn, Cupp, Moore, Samuel, Aiyuk. Flowers, Rice, Dell, and Nacua this past year.
That said, it will depend on FA. If the Bears sign a clear #2, say Calvin Ridley or Hollywood Brown or Gabe Davis, then I think it's pretty easy to wait unless the value is too much to pass up. If they don't you kinda have to draft one in the top 3 rounds because it's pretty obvious Mooney isn't a #2 anymore. That could change with a different OC and or Qb though.