Don't take it from VFS , they are merely acting as a courier to your documents. Stick to what IRCC ADVO told you and inform them like they instructed. Document's wont take more than 1 days to fly back to Oman after they are released from their side.Yea i submitted on 24th to Vfs oman, i sent mail last week to abudhabi office that i have flight on begining of april, they replied saying, send to us again one week before your flight if you didnt get your passport back on this time.
Btw, the lady in Vfs oman told me it will take 10 working days,l