Could you come to work an hour earlier than usual tomorrow?
Literal
Tomorrow, always [comparison-より] 1-hour early go-to-work [nominalizer-こと] [topic-は] can?
いつもより1時間早く uses ~より for comparison — 'earlier than usual.' 出勤する ('to go to work, to commute in') is a formal suru-verb. ~することはできますか is a polite potential question using こと-nominalization.