Mussar: Bless the Work.

Derech Emet:

Kitzur Shulchan Aruch, chapter 183, end of paragraph 5:

It is proper conduct [Derech Eretz] that when you see
your fellow occupied with his work, you should bless him
by saying:

May you succeed in your activities [Tatzliach BeMaasecha].

ALTERNATE TRANSLATION:
May you be successful with your work.

CHRONOLOGY:
Rabbi Shlomo Ganzfried lived in Hungary from 1804 to 1886 CE.

Kitzur Shulchan Aruch was first published in year 1864 CE.

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Best Regards,
RRW