punctual
US /ˈpʌŋk.tʃu.əl/
UK /ˈpʌŋk.tʃu.əl/

1.
pontual, a tempo
arriving or doing something at the agreed or correct time; not late.
:
•
She is always very punctual for appointments.
Ela é sempre muito pontual para compromissos.
•
The train arrived exactly on time, proving to be very punctual.
O trem chegou exatamente na hora, provando ser muito pontual.