Normally, I'd be somewhat dismayed with how long it's taking for OS 10.15.5 to be released. But with this COVID-19 business, and that OS 10.15.4 is working fine for me, it's not surprising. As it is, I would not be surprised if the next version of the Mac OS, OS 10.16 (anyone know the name of it?), is not released at the "usual" time, ie, in the September-October time frame.