Early check-in for International Departures @ SYD

[Arthur T]

I am flying overseas at about 7pm on a weekday, where I will have to work during the day.

My airline that will be flying with (not Qantas) do have several flights in the morning on the same day, and I don't want to bring my luggage to work.

Therefore may I ask is it possible if I can do my bag drop and check in during the check-in time for the morning flight then go straight to the gate on the evening after work?

Thank you.