Information related IPC 279 and 337

Namskar, I am serving in indian coast guard, ministry of defence. Now i am posted in colaba, mumbai. I was on driver duty on 30 nov 17,i met with an accident while driving our service ambulance from our unit(colaba) To CST. I had just left our main gate and while taking right turn one bike has suddenly bambarded on left side of bonnet. Ambulance speef was very slow to execute turn. When i was turning the vehicle towards right, on my right side one BEST bus was on halt at bus stop to get down the passenger . So after clear view on my right i started to execute right turn with horn and right indicacator. At the same time one high speed bike overtake the halted bus and he coudnt control the bike and directly srtuk on on our vehicle. He registered case agaist me. Charges filed 279 and 337 . Now already 10 months passed till the time chargesheet has not filed by police staion in court? How much time limit to file the chargesheet? R they able to file the charge sheet now? I have listen within 90 days they should file the chargesheet? What should i do now? What will be the direction of this case hencefurthe? Thanks