The bill only applies to early release for non-violent offenders. That will make for more room to house violent offenders. The federal prisons currently cost us taxpayers an average of $36,299.25 ($99.45 per day) to warehouse non-violent offenders.
That actually is untrue— https://www.nationalreview.com/2018/11/first-step-criminal-justice-reform-bill-whats-in-it/ —and even many “nonviolent” offenders are only nonviolent in that they took a plea deal for the lesser charges of what they committed.