This post from Wikipedia offers a brief introduction to the daytime Kiddush, including an explanation of how it differs in status and content from the nighttime ritual. It also provides the Hebrew and English text of the Kiddush, while mentioning that there are many different accepted customs.
Daytime Kiddush
Since the Shabbat morning kiddush is rabbinically rather than biblically mandated, it has a lesser status than the Friday night kiddush. In order to elevate its importance, it is euphemistically referred to as «Kiddusha Rabba«—קידושא רבא—»The Great Kiddush.» There are different versions for the kiddush on Sabbath morning, and it is generally shorter than the Friday night kiddush. Originally, this kiddush consisted only of the blessing over the wine. Later, additional verses related to Shabbat were added. However, there are a wide variety of customs as to which verse are recited, and in some congregations no verses at all are recited.
Morning Kiddush Text
וְשָׁמְרוּ בְנֵי-יִשְׂרָאֵל, אֶת-הַשַּׁבָּת, לַעֲשׂוֹת אֶת-הַשַּׁבָּת לְדֹרֹתָם, בְּרִית עוֹלָם. בֵּינִי, וּבֵין בְּנֵי יִשְׂרָאֵל—אוֹת הִיא, לְעֹלָם: כִּי-שֵׁשֶׁת יָמִים, עָשָׂה יְהוָה אֶת-הַשָּׁמַיִם וְאֶת-הָאָרֶץ, וּבַיּוֹם הַשְּׁבִיעִי, שָׁבַת וַיִּנָּפַשׁ.
זָכוֹר אֶת-יוֹם הַשַּׁבָּת, לְקַדְּשׁוֹ. שֵׁשֶׁת יָמִים תַּעֲבֹד, וְעָשִׂיתָ כָּל-מְלַאכְתֶּךָ. וְיוֹם, הַשְּׁבִיעִי—שַׁבָּת, לַיהוָה אֱלֹהֶיךָ: לֹא-תַעֲשֶׂה כָל-מְלָאכָה אַתָּה וּבִנְךָ וּבִתֶּךָ, עַבְדְּךָ וַאֲמָתְךָ וּבְהֶמְתֶּךָ, וְגֵרְךָ, אֲשֶׁר בִּשְׁעָרֶיךָ. כִּי שֵׁשֶׁת-יָמִים עָשָׂה יְהוָה אֶת-הַשָּׁמַיִם וְאֶת-הָאָרֶץ, אֶת-הַיָּם וְאֶת-כָּל-אֲשֶׁר-בָּם, וַיָּנַח, בַּיּוֹם הַשְּׁבִיעִי; עַל-כֵּן, בֵּרַךְ יְהוָה אֶת-יוֹם הַשַּׁבָּת—וַיְקַדְּשֵׁהוּ.
סברי מרנו ורבנן ורבותי
בָּרוּךְ אַתָּה יְיָ אֱלֹהֵינוּ מֶלֶךְ הָעוֹלָם בּוֹרֵא פְּרִי הַגָּפֶן
(Some begin with Isaiah 58:13-14.)
And the Children of Israel shall observe the Shabbat, by establishing the Shabbat for their generations as an eternal covenant. Between Me and the Children of Israel it is an eternal sign, that [in] six days the LORD made the heavens and the earth, and on the seventh day He ceased from work and rested. (Exodus 31:16-17)
Remember the Shabbat day to sanctify it. Six days you shall labor and do all your work, but the seventh day is Shabbat for the LORD your God; you shall not do any work — you, your son and your daughter, your manservant and your maidservant, and your cattle, and the stranger who is in your gates. For [in] six days the LORD made the heavens, the earth, the sea, and all that is in them, and rested on the seventh day. Therefore, the LORD blessed the Shabbat day and made it holy. (Exodus 20:7-10)
Attention, gentlemen, [rabbis, and my teachers]!
Blessed are You, LORD our God, King of the universe, who creates the fruit of the vine. (Amen)
After the kiddush (as for any other blessing) those present say «amen,» which means «truly.» Those who say «amen» are considered to have said the kiddush by proxy.