Do you think it will be as accurate as the 2016 General Election exit poll?
I expect some Moore voters will not agree to be polled. Some will lie.
Alabama didn't get an exit poll for the 2016 general election. But, I think it's possible you see some Jones voters lie about their intentions. A vote for a Democrat may be worse to admit than a vote for an alleged child molester.
That is a definite possibility.
I don't think the whole "social desirability bias" theory applies to Alabama. Exit polls might show a polling error in the Birmingham and Huntsville region.