What are his chances of walking without any jail time.

Discuss this with a local criminal defense attorney. Much more info is needied to accurately evaluate his chances. For example, does he have priors? if so, what for? Age, mental state at time of event, damage dollar amount, previous banishment from same property? See where I'm going with this?

Maybe. It depends on how the case goes (to what exactly he pleas or is found guilty), along with other factors such as prior criminal history and history with the specific victims. If you are concerned and think that he should not go to jail, then speak with his defense attorney. If you are concerned and think that he should go back to jail, then speak with your Victim Witness Advocate at the prosecutor's office.

Before your question may be answered accurately, an experienced attorney needs to be engaged and given all the facts. Those facts, coupled with the accused's criminal record, will determine the chances of more incarceration. As an attorney who has tried many cases in Fulton County, I believe the accused needs to act quickly to resolve his case because Fulton is often the slowest county due to it having the largest caseload in Georgia.