Remember that your application for endorsement does not automatically extend your current leave/visa you’re holding in the UK while it is under consideration. If your visa i.e. ‘leave to remain’ expires while you are waiting for endorsement, you have to leave the UK otherwise you will be considered an overstayer in the UK. Check if there are any concessions provided by the government, due to Covid 19 and you may be able to continue to live in the UK.