A Commentary, Critical, Practical, and Explanatory on the Old and New Testaments, by Robert Jamieson, A.R. Fausset and David Brown  at sacred-texts.com
psa 92:1A Psalm-song--(see on Psa 30:1, title). The theme: God should be praised for His righteous judgments on the wicked and His care and defense of His people. Such a topic, at all times proper, is specially so for the reflections of the Sabbath day. (Psa 92:1-15)
sing . . . name--celebrate Thy perfections.
psa 92:2in the morning, . . . every night--diligently and constantly (Psa 42:8).
loving kindness--literally, "mercy."
faithfulness--in fulfilling promises (Psa 89:14).
psa 92:3In such a work all proper aid must be used.
with a . . . sound--or, on Higgaion (see on Psa 9:16), perhaps an instrument of that name, from its sound resembling the muttered sound of meditation, as expressed also by the word. This is joined with the harp.
psa 92:4thy work--that is, of providence (Psa 90:16-17).
psa 92:5great . . . works--correspond to deep or vast thoughts (Psa 40:5; Rom 11:23).
psa 92:6A brutish man knoweth not--that is, God's works, so the Psalmist describes himself (Psa 73:22) when amazed by the prosperity of the wicked, now understood and explained.
psa 92:8This he does in part, by contrasting their ruin with God's exaltation and eternity.
most high--as occupying the highest place in heaven (Psa 7:7; Psa 18:16).
psa 92:9A further contrast with the wicked, in the lot of the righteous, safety and triumph.
psa 92:10horn . . . exalt--is to increase power (Psa 75:5).
anointed . . . fresh--or, "new"
oil-- (Psa 23:5) a figure for refreshment (compare Luk 7:46). Such use of oil is still common in the East.
psa 92:11see . . . [and] . . . hear my desire--or, literally, "look on" my enemies and hear of the wicked (compare Psa 27:11; Psa 54:7) --that is, I shall be gratified by their fall.
psa 92:12The vigorous growth, longevity, utility, fragrance, and beauty of these noble trees, set forth the life, character, and destiny of the pious;
psa 92:15and they thus declare God's glory as their strong and righteous ruler.