Translation of "at work" into Japanese

My father won't have any noise while he is at work.

私の父は仕事中は雑音を一切好まない。

I have to be at work earlier tomorrow.

明日 少し 早め の 出勤 な ん だ

Among other things, these time thieves were habitually late, left work early, and socialized with other employees while at work.

おもな形態は,習慣的な遅刻,早めの切り上げ,勤務中の雑談でした。