Adam and Eve worked – so work was part of God’s plan for mankind even before the Fall.
Contrary to popular belief, the need for man to work is not part of the curse. It is true that the ground was cursed and man was told that he would have to work hard to survive in the world:
But before the Fall or the Curse, man had already been given work:
Gen 2:15 The LORD God took the man and put him in the Garden of Eden to work it and take care of it.
So the oldest profession is actually gardening or farming.
The point is though that Adam and Eve were not just sitting around in the garden all day eating fruit and ‘loafing’ – they were placed in the garden “to work it and take care of it”.