Most common is allowing the inspection of the list of absentee requestors, like in North Carolina: The chief election judge of each precinct is required to post one copy of the precinct absentee ballot list “in a conspicuous location in the voting place.”
That said, there are other states that do not allow this, so it's less widespread than I originally thought, and when it is allowed, it's usually either just the absentee requestors, or the list is made available after the election, not during. Sorry.
Most common is allowing the inspection of the list of absentee requestors, like in North Carolina: The chief election judge of each precinct is required to post one copy of the precinct absentee ballot list “in a conspicuous location in the voting place.”
That said, there are other states that do not allow this, so it's less widespread than I originally thought, and when it is allowed, it's usually either just the absentee requestors, or the list is made available after the election, not during. Sorry.