There are multiple definitions - click on the translation that matches your context.

oportunamente

advérbio

full

due (in due time)

adjective

Definitions of due (in due time)

at an appropriate time in the future

The truth will come out in due time (=in due course).

if you pay a bill in due time then you pay it either before it must be paid or at the time it becomes due for payment

The borrower failed to make payment in due time as required under the loan agreement.