What is the Attack Roll for Deflect Missile?

I think I understand the basics of the ability that the Monk gets, but just wanted to check if I was right:

  • If the Monk is successful at catching a missile and then throws it back at the target, do you roll a d20 + Dex + Proficiency bonus to hit, just as if it was a normal arrow fired from a bow (for example)?

  • Then the damage caused is your Monk Dice (1d4 at level 1) + Dex?