Updating Address while FLR(M) application in progress

[Driver27]

Hi

My wife's FLR(M) application is still in progress. We were asked to provide additional documents which we did on the 8th of August. We will be moving home on the 15th of August.

1. Do I still update the address via this link - https://visa-address-update.service.gov.uk/

2. When should I actually update the address? I'm worried that if I was to leave until after I have moved (15th August), I'll miss it just in case they happen to post it on the 14th or before!

3. The only document I have to prove address at this point is a tenancy agreement that was mailed to me, this doesn't have the land lords signature! Do you think this will be rejected.

4. Is there any way to tell the home office to hold off on posting anything to us until we can get further proof we have actually moved.

Thanks for all your help