do they appear in textual sources from that era?
Yes,  "Teaching for King Merykara", "Tale of the Two Brothers", "The Blinding of Truth by Falsehood"
Egyptian mythology
Themes and motifs from mythology appear frequently in Egyptian literature, even outside of religious writings. An early instruction text, the "Teaching for King Merykara" from the Middle Kingdom, contains a brief reference to a myth of some kind, possibly the Destruction of Mankind; the earliest known Egyptian short story, "Tale of the Shipwrecked Sailor", incorporates ideas about the gods and the eventual dissolution of the world into a story set in the past. Some later stories take much of their plot from mythical events: "Tale of the Two Brothers" adapts parts of the Osiris myth into a fantastic story about ordinary people, and "The Blinding of Truth by Falsehood" transforms the conflict between Horus and Set into an allegory.
map of tombs in valley of the kings In 1799, members of Napoleon's expedition to Egypt (especially Vivant Denon) drew maps and plans of the known tombs, and for the first time noted the Western Valley who were these tombs built for? For the pharaohs and powerful nobles of the New Kingdom can you name some of the artefacts found inside these tombs? The royal tombs are decorated with scenes from Egyptian mythology and give clues as to the beliefs and funerary practices of the period. Almost all of the tombs seem to have been opened and robbed in antiquity, but they still give an idea of the opulence and power of the pharaohs. can you name some deities who feature in the mythology you just mentioned? Ra,  Osiris, Isis, Horus,  Set.
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Egyptian mythology [SEP] In literature
Themes and motifs from mythology appear frequently in Egyptian literature, even outside of religious writings. An early instruction text, the "Teaching for King Merykara" from the Middle Kingdom, contains a brief reference to a myth of some kind, possibly the Destruction of Mankind; the earliest known Egyptian short story, "Tale of the Shipwrecked Sailor", incorporates ideas about the gods and the eventual dissolution of the world into a story set in the past. Some later stories take much of their plot from mythical events: "Tale of the Two Brothers" adapts parts of the Osiris myth into a fantastic story about ordinary people, and "The Blinding of Truth by Falsehood" transforms the conflict between Horus and Set into an allegory.