First of all congratulations!
252 days is too much, was it a straight forward application, was there any red flag, or did you need to update any document or change any information on your file. If there is no change at your application after submissinon, I should not expect anything before 250 days either. My AOR date is Dec 14, Today I am on day 199. I have also applied to extend my work permit yesterday, fingers crossed