I was going to say the same thing. The earlier the better. Your response time does affect your processing time. With Covid, places can decide to close at any time without explanation. Do not procrastinate if you have a choice. Good luck.I would suggest getting it done as soon as you can. If you wait to do it, then that is that much more time that you have to wait for them to process it. Plus, you don't know when another lock down may come about to cause you issues. I read another poster that said they got the letter and finally got a plane ticket for some place that had testing open since his/her country had their center closed. They had the appointment, but then the country was shut down and he/she could not go to get the medical done and ran out of time despite the extension. Good luck. I am still waiting for SA and the requests myself.