The signing deadline for OBJ, and any other player, to be eligible for the upcoming NFL season depends on the specific circumstances of their free agency status. If a player is an unrestricted free agent, they can sign with any team at any time, as there is no specific deadline for them to sign by. However, if a player is a restricted free agent, they have until April 23rd to sign an offer sheet with another team. If they do not sign by this deadline, their rights revert back to their original team. Additionally, if a player is a franchise tagged player, they have until July 15th to sign a long-term contract with their team. If they do not sign by this date, they can only play under the one-year franchise tag for that season. It's important for players like OBJ to be aware of these deadlines to ensure they can secure their position on a team for the upcoming season, and to negotiate the best contract terms for their future in the league.