With its Uber Freight packers and movers app, Uber established the concept of on demand delivery regardless of the shape, size or weight of the items.
The way this app works is very similar to the way a normal taxi app should work.
and this app works more or less in the exact same fashion.
Freighters looking for a job will stay online on the app and when they get a job request, they will accept it and be on their way to collect the order.
A delivery driver will be very clear about the kind of money he can expect for a particular job and then accept or decline based on that.