As
@najaB said - today, you do not have a conviction. Once the court date has been and you have been sentenced, then you will have a conviction.
As your position/profession seems to be one which is exempt from the Rehabilitation of Offenders Act, you will need to declare this conviction every time you are asked, once the conviction has gone through, regardless of whether or not it is spent. You should check your contract or course rules to see if you have a legal duty to inform them immediately of any conviction once it has happened - you probably will.