I understand that CW is now more strict on how many days in advance of our permission to stay stamp that we apply for our next extension.
My current covid extension expires on Saturday 4th September.
What date do I need to attend CW to apply for my next extension?
TLDR : Answer Summary
To apply for your visa extension, you can do so no earlier than 3 business days before your current expiry date. Therefore, you can apply on September 1st, 2nd, or 3rd. You may also apply on September 6th, but this will result in an overstay stamp, which can have its fine waived.