If you use Carbon Copy Cloner, you've probably seen an update available notice by now. It's usually interesting to read the accompanying "change log", if an app actually includes one. For the last several updates the CCC dev has been adding things that will be needed when Big Sur arrives. These are certainly 'food for thought'.
We were anticipating its release by now, but we're grateful that Apple is taking some additional time, hopefully to resolve some outstanding problems.