Getty Images says:
Mark Grace #17 of the Chicago Cubs throws the ball to third base during a May, 1990 season game.
Yep, checks out.
It’s clear even from just looking at how Grace is throwing the ball that this isn’t game action. He’s clearly lobbing the ball around the infield as players warm up between innings.
This is confirmed by the view of the auxiliary scoreboard on the facade of the upper deck. It shows the Cubs leading the Dodgers 1-0, heading into the sixth inning.
This game was played Wednesday, May 23, 1990 at Wrigley Field.