。
I'll get up at 6 tomorrow.
Literal
Tomorrow [topic-は] 6-o'clock [at-に] wake-up.
6時に起きます — a simple declarative about waking time. 起きる is intransitive ('to wake up'), forming a transitive/intransitive pair with 起こす ('to wake someone') — one of the dozens of ~きる/~こす verb pairs in Japanese where the same root distinguishes 'X happens' from 'someone causes X to happen.'