Health, you managed to look up the Be’ur Haytev. I am happy that I was gorem you to open a sefer and I take integral part in that zchus.
Another s’mach and rayah that one must not say “good shabbos” before the sun is going down on Friday and all your work is done.
There is a famous and beferushe song of Reb Abie Rotenberg shlitah.
The lyrics clearly point out when is the time to say “good shabbos”:
The sun is going down, it’s shining through the trees.
Another week’s gone by, become a memory.
So throw away your hammer, there’s nothing left to do.
Go on home and find the gift that’s waiting there for you.
(Refrain)
It’s time to say “good shabbos” ’cause all your work is done.
gonna spend a a day together with the holy one
Say a special blesing on a cup filled with wine
Man and his Creator, it’s a very special time.
I am sure you will try to shlog op this rayah too, but it is an accepted song b’chol tfutzos yisroel (I even heard one of illustrious R.Y. at BMG hmming the zemer).