The expiration date of your visa is the last day you may use the visa to enter the United States. It does not indicate how long you may stay in the United States. Your stay is determined by the Department of Homeland Security at your port of entry.
In some circumstances, a person may be released from custody without bail and be given an order to appear, with certain conditions as governed and directed by a court-affiliated agency. Project Remand ('PR'), a Ramsey County pre-trial court service program, is one example of such an agency.
A bail bond is an insurance product that guarantees the appearance of a defendant in court. It involves an legal agreement between the bail agent, insurance company, indemnitor and court that the defendant will show up for all court appearances or be liable for the full amount of the bond to the court.