1)
Will he tell Hashem's salvation the entire day?
1.
Radak: He will tell it all days. The same applies to "Osecha Kivisi Kol ha'Yom" (25:5).
2.
Malbim: I will tell Your virtue, that Your salvation is the entire day. I cannot exist for a moment without You; I constantly need salvation!
2)
What is the meaning of "Lo Yadati Seforos"?
1.
Rashi: I cannot count the acts of Tzedakah and salvations that You did for me [Radak - because You constantly do good things for me. Seforos is a noun, like Misparim. The grammatical form of Seforah is like Besorah.
2.
Malbim: Every moment I received 1,000 miracles that I cannot count at all.
