Well, regardless of arrest, if you are terminated by your employer, you are supposed to leave the U.S. immediately. There is no grace period. Usually, no one cares if you leave within 10 days. Realistically, no one is going to come knocking on your door for many months or even years. The automatic penalty comes when you accrue 180 days or more of unlawful presence. At that point, you activate the 3 year bar that you cannot come back to the U.S. for 3 years unless you get a very hard to get waiver. It becomes 10 years if you accrue 1 year or more of unlawful presence. So, even if you lose your job today and you wait until September 15th to go to court and then you leave the U.S., you would have much less than 180 days of unlawful presence. The less time you have of unlawful presence under 180 days, the easier it will be to convince a visa officer in the future that your overstay was brief, reasonable and will not happen again.
At this point, I don't believe you are required to inform anyone at work unless you have an employment contract and that contract requires it of you. If you do not, then I would not say anything and have a criminal law attorney handle it as quietly as possible. The idea is to get a dismissal if you can and if you cannot, at least get the charges reduced to a misdemeanor and if you have to be sentence, that the sentence be for less than 6 months in jail. This way it falls into the petty offense exception and does not make you inadmissible or deportable from the U.S. Here is a link:
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