I was not successful with the -R option. However, I was successful with making 
the following change in raspi-config:

$ sudo raspi-config
-System Options
-Network at Boot
"Would you like boot to wait until a network connection is established?”  Yes

I’m sure it’s probably not the best solution, but it works for me!

FYI  -  Raspberry Pi 4 Model B Rev 1.1,   Raspbian GNU/Linux 10 (buster).

Would love feedback if enabling “Network at Boot” is a bad idea.

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