I was a Bank Teller and also hired as a cleaning person. I semi retired from the teller job and just do the cleaning as a bank employee. If anything should happen, robbery,break-in etc. while or after I'm done cleaning, would I still be covered under the banks bonding policy for damages.

That depends on the policy, only the bank can answer that. Also it is not bonded you need, that covers you doing something, but the banks own liability and commercial property policy would or should cover robbery.