Belgium Short stay student Visa sent to FPS

I have to go for student exchange program in Belgium and it begins on 17 September. I applied for a tourist visa (because I had very short time for getting my visa back and the time I needed the visa for was <90 days and I didn’t know that I’m such case short stay student visa is required). I had mentioned in my cover letter itself that the purpose was student exchange but only <90 days and hence didn’t require a type d student visa. A few days later embassy called me regd the same, and on realizing, I requested them to convert my visa to short term student visa, which they agreed to , and asked me for fee additional documents (NOC from current institute, financial documents (I had submitted student loan approval, they were not satisfied, so I liquidated some investments and sent bank statement)). I emailed those the very next day. Next working day I got an email saying my file had been forwarded to the FPS. When I called the embassy they said they got the documents and mentioned my category change request to visa officer but are not aware whether it’s been changed or not. This was 2 days ago. The tracking status shows “en traitement”

What are the chances I’ll get my visa in time? Or it’ll get approved at all, even by the end of the month.