Not sure if I understood your question.
Why do you need to know the Status Number? The event that you have configured in BSVW will be triggered based on the status selected by user . (after Saving the quotation ). You can use that event to act as a "triggering event" to trigger your workflow
So if you want to do different things based on different status
1. you can either trigger different event by configuring it in BSVW and you can use that event to act as a "triggering event" to trigger your workflow. or
2. You can add a background step / Method at the beginning of your workflow and write ABAP code using STATUS_READ FM to get the status details from your quotation. ( Hint : get VBAK-OBJNR and use it as input in STATUS_READ FM ) or
3. Create a Subtyp of BUS2013 and add a custom attribute and get the status in similar way as explained in Step 2. or
4. Add a Check function module and can stop the workflow by retrieving the status using ABAP code
R