Getting released on a $50,000 bond without any payment is not realistic. The bond system exists to ensure he appears at all court dates, and the court will not simply waive it. A bail bondsman can secure his release for approximately 10 percent of the total bond amount, which in this case would be around $5,000, and may also require collateral such as a car or real property. That 10 percent fee is not returned once the case resolves. If the full $5,000 is out of reach, remaining in custody is the practical alternative until the case moves forward.
On voluntary departure: this is an immigration option that allows a person to leave the country voluntarily rather than being formally removed. It can be a faster path out of detention, but it comes with significant consequences. A voluntary departure order does not carry the same formal bar as a removal order, meaning the legal impact on future entry is less severe than deportation. However, it does not mean he can simply return. His ability to reenter the United States afterward depends entirely on his immigration status, whether he has a valid visa, and the outcome of any pending immigration proceedings. If there are no other legal grounds for return, voluntary departure makes coming back legally very difficult.
This situation requires an immigration attorney. The difference between a well-managed voluntary departure and a poorly handled one can determine whether he ever has a legal path back into the country.