Unfortunately, you are at the mercy of the LSBN. BONs tend to move slowly when it comes to these things.
Also, keep in mind that what the BON decides and what your school decides may be two very different things. The BON may end up being fine with your criminal record. However, your school may still prevent you from doing clinical. That's because your criminal record has to satisify the requirements of the facilities which you are doing clinical at. If the site won't let you do clinicals and your school can't find an alternative site where you can do then, you will be stuck.
Are you sure the delay is with the BON and not the school/clinical site?
Best of luck.