I think the simplest design is the best for presenting complex data, and in your case trying to combine five different stages along with the percentage completion of the stage in one status bar might not be as elegant as showing five different bar charts in a consistent manner.
I understand the need to focus on a particular stage (i.e. Delivered) because that's probably what the customer is most interested in, so you might choose to highlight it in a slightly different way while still maintaining consistency with the other stages.
I simulated two ways to implement this design concept, the top section shows the percentage complete based on the number of items that have been processed at each stage (independent of the overall quantity). This way of showing the information allows you to focus on which stage is processing items quicker, which means that some stages can be 100% complete based on the number of items currently in that stage.
The bottom section is a representation of a 'funnel', in which the percentage processed is based on the overall quantity, so that the process is complete only when all of the bars reach 100%
And then based on the bottom concept, which I found a little bit more interesting to play with, I used uniform blocks for each stage and added a colour based weighting to represent the values. I simulated the result and it actually looks like a natural progress bar but with an unevenly distributed gradient.
I hope this gives you an idea of what the status bar can look like when filled with actual data, and how the design strategy and focus can influence what the best way to visualize the information might be.