In talking to Jehovah's Witnesses I found it difficult to discover what they believed on these three attributes:
Omnipotent - God cannot be thwarted by the Devil, sin, sinners, or the world but is all-powerful in all things.
Omniscient - God knows all things about all things, past, present and future, all the time. Nothing escapes his knowledge, including our thoughts & motives.
Omnipresent - God is in all places, at all times, in the fullness of his being. It is not just a bit of God everywhere, but all of God is everywhere all the time.
So he does not need angels or anyone else to inform him of anything anywhere at any time.
What is the Jehovah's Witness belief on these matters?