“until the full light of day.” The Hebrew phrase is literally, “until the day is established,” but that might be unclear to the English reader because we are not familiar with the idiomatic speech used in the Hebrew Bible. The meaning is “until the full light of day,” when the sun is up and the light is bright.
This is a very encouraging verse because it points to the reward in this life for being faithfully righteous. It takes time to develop an understanding of God and life, but that understanding brings a blessing and comfort to those that have it. Life may not get easier as we grow in the Lord, but our increased knowledge and understanding makes life make more sense, and makes it easier to bear hard times. This verse is not speaking of the full light of day being our next life—it is encouragement for this life—but the blessings of the next life might be considered an undertone in the verse.