Русско-англо-русский юридический словарь

divisible contract – type of contract in which each party's obligations are independent of those of the other, and each party can demand performance from the other without performing its own part. Contracts of employment, for example, are usually divisible: the employee must work even if the salary is not paid on time. A contract, however, does not become divisible simply because it has to be completed in parts or stages. (BusinessDictionary)

If you arrive punctually, you arrive at the right time, neither late nor early - you arrive on time. [...] In time has a slightly different meaning from on time. If you do something in time, you do it with time to spare - before the last moment. (BBC Learning English)

The train left exactly on time. The show started exactly on time. (BBC Learning English)

get down to work: to start working

// You need to get down to work if you want to finish the assignment on time. (Merriam-Webster)