At the end of this step all the quotes, orders and invoices are imported and they are all at their initial states i.e. all quotes are draft.
At the end of this step data is imported and matched. Again remember that the records are in their initial status.
For data size of NOT SMALL, you could use a custom plugin or DB update to change the status of the data. If you want to create a plugin refer to this walkthrough. The plugin could be fired on a fake event (such as creation of a case), to query all the desired data and change their status. Other method for status change is DB update, which I prefer. Remember that from the MS support point of view, DB updates are not a good and desired job!
At the end of this step the data is imported and the status is mapped. The link between all the data is created. Hence, the imported records could be used at the rest of their sales procedures.