I let the server sit over this past weekend. On Sunday night the Download percentage was still at 0%. So I decided I needed to test getting this update installed now that Windows Defender is uninstalled regardless of the downloading problems. I tried running the update from an .msi file I downloaded from the Windows Update Catalog. Unfortunately, it behaved the same way. After rebooting the update tried to finish installing and then reverted once it reached 99%. Windows Update has been able to recognize that 2019-02 CU is available, as it's listed in the update status, but Downloading updates does not get beyond 0% anymore.