Hi Drew, thank you yet again for all of your kind assistance. Interestingly enough I'm usually the guy telling friends and co-workers to avoid opening emails from whom you do not know, etc. Several also send me their emails asking if it Spam, etc., and it usually is or at least does not look valid. So, you can imagine my surprise and embarrassment from your critique. I'm obviously going to have to buck up and do a better job in the future than I have in the past.
Separately, I did not mean to imply that my MBA was having exactly the same problem as my Mini, but I thought I would take advantage of your guidance to ensure a clean system there, as well.
Finally, in direct response to your most recent guidance I have: 1) Deleted both Sunflowers, as I don't think I've even used them since installed back in 2012 or so; 2) I deleted GoToMeeting, as I can always download it, if needed for a meeting; 3) I recently installed (within last month) Teamviewer at the recommendation of a friend who found it — we both get calls from colleagues with Mac problems, and he says this allows him to control the friend's Mac for a more efficient troubleshooting episode. I expect to need it, although I haven't used it yet. I'm aware of being able to do the same thing via Messages, but I've never been able to get my friends to set up their Messages to accept takeover when desired; and 4) I deleted DiskWarrior, which I haven't used for years (thankfully, I only needed the one time when I bought it).
I don't really understand what you say in your last paragraph, "I can see why you are running out of RAM, perhaps once the software update is finished it may settle down? Otherwise, performance could be helped by doing less (maybe fewer Safari tabs). Ideally, the Swap used will be 0 (or very close to it over several hours)," but maybe I don't need to. I was not aware that I was running out of RAM, although I've looked at it a couple of times in response to reading Mac articles — I'm just never sure what to execute for improvement or not and how to measure improvement.
P.S. I'm not sure what you mean by fewer Safari tabs — Do you mean that I have too many so-called "Favorites," and that slows down my system performance?
I know I've said this before, but I'll say it again, "Thank you, thank you, thank you." Same goes out to Old Toad, Kappy, and Thomas_r.