。
What time could you come here tomorrow?
Literal
Tomorrow what-time [at-に] here [to-へ] [honorific-おいで]-receive-can?
おいでいただけますか is keigo — おいで (honorific for 来る/行く/いる) + いただけますか (potential of the humble いただく + question). This is a highly respectful way to ask when someone can come, appropriate for addressing a superior or valued client.