Routine

We’re supposed to start work at nine, but I often come in later because I have to take my children to school first, but then I stay a little later. Of course, if I have an early meeting or if I have to be in court first thing in the morning, my wife has to take the kids to school.

American Inside out - Teacher's book.

According to the text, in “We are supposed to start work at nine, (...)”. The underlined words are closest in meaning to “We are to start (...)”