According to the sports payroll evaluation website, Spotrac, those two moves cleared about $ million in salary cap space for this season. That places the New York Giants at No. 18 in available cap money right now.
Another thing to mention is that general manager Dave Gettleman seems to be more circumspect about the salary cap than his predecessor, Jerry Reese. While Barwin and Stewart were a complete waste of money in 2018, there will not be any lingering effects from signing each player.
With an apparent cap credit of $250,000 for Stewart, both players only account for $115,000 in dead cap space in 2019.