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.
Bail is a financial arrangement that a bail bonding agency will make on behalf of the criminal defendant. A bail bonding agency, acting for the defendant, will arrange with the court to have a suspect released from jail pending the trial in exchange for money or collateral, which may be cash, assets, or a bond.