The tax deferred annuity must qualify under the Internal Revenue Code sections 401(a) 403(a) 403(b) or 408A. Generally if there is a penalty for early withdrawal then the plan qualifies and is exempt. Most retirement accounts are exempt. The overall exemption states that "... to extent reasonably necessary for the support of the debtor ..." I would talk to an attorney to be safe.
The automatic stay when the bankruptcy is filed would stay all collection actions with a few exceptions, such as for support obligations.
I am not familiar with Oklahoma law. However, I believe that most states allow for the protection/exemption of property from collection. In addition, I know you are allowed to exempt property in a bankruptcy, however the amounts vary from state to state and often times consider family status. I would consult an attorney the fee for the consultation is often minimal and sometimes there is no charge