As most of you have already noticed TeX Live 2019 has been frozen and work on TeX Live 2020 has started. If you are using TeX Live 2019 or BasicTeX 2019 you might get one last update (using TeX Live Utility or tlmgr directly) if you haven't updated in a while.
If you wish to help with testing MacTeX-2020-pretest and/or BasicTeX-2020-pretest please read the information at <http://tug.org/texlive/pretest.html> and download mactex-20200309.pkg and/or mactex-basictex-20200309.pkg from one of the special repositories linked to the site above. Please note the 20200309 which presently is the latest version --- don't download an earlier version if the repository hasn't updated yet.
It is possible to set TeX Live Utility (or tlmgr directly) to use one of the repositories notes above to do updates to your system.