Αύριο ο συνάδελφός μου θα δουλεύει από το σπίτι όλη μέρα.

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Breakdown of Αύριο ο συνάδελφός μου θα δουλεύει από το σπίτι όλη μέρα.

• μου: my
• αύριο: tomorrow
• από: from

Questions & Answers about Αύριο ο συνάδελφός μου θα δουλεύει από το σπίτι όλη μέρα.

Why does ο συνάδελφός μου have two accent marks?

Because the weak possessive μου is an enclitic. When an enclitic follows a word stressed on the antepenultimate syllable (like συνάδελφος), Greek adds a second accent on the final syllable to keep the stress within the last three syllables. Hence: ο συνάδελφός μου.
Compare:

• ο άνθρωπός μου (antepenultimate → adds a second accent)
• ο φίλος μου (penultimate → no extra accent)

Why is the possessive μου placed after the noun? Can I say ο μου συνάδελφος?

In Greek, the weak possessive pronouns (μου, σου, του/της, μας, σας, τους) follow the noun phrase: ο συνάδελφός μου. You cannot put μου in front. If you need emphasis or a “my own” meaning, use the strong form δικός:

• ο δικός μου συνάδελφος = my colleague (as opposed to someone else’s)

Do I need the article ο even though I already say “my colleague”?

Yes—Greek typically keeps the definite article with a noun that has a possessive: ο συνάδελφός μου. Omitting it (συνάδελφός μου) is possible in certain styles (e.g., headlines, vocatives, after “είμαι”), but the normal, neutral form includes the article.

What nuance does θα δουλεύει have compared to θα δουλέψει?