This nice color photo of the bleachers and scoreboard caught my eye and so I thought I’d do some sleuthing.
One thing you see right away is the shrubbery in the hitters’ background. That was replaced by the current bleacher suite when the Ricketts family bought the Cubs. So this has to date before then.
ARIZONA and FLORIDA are on the board, so this has to date from 1998, when the Diamondbacks entered the league, and before 2012, when the Marlins changed their designation to MIAMI.
It’s probably a Saturday or Sunday, as there’s only one night game listed, the White Sox at the Mariners.