I'm getting ready to submit my application, but I'm still waiting for my husband to send me some documents. I'm debating on whether to submit my online application before the documents actually get here though as I have the assumption that the biometrics appointments can't actually be made the same day as you submit. From what I've gathered it might actually take a week to have that appointment, and I want to submit as soon as I get those documents from my husband. Anyone have any advice?
I would highly recommend that you do NOT submit your online application until the documents are in your hand, and you have checked to make sure everything you need is there.
In the past, there have been a few instances where people submitted their online application, but there was an unexpected holdup with the documents arriving in the US (ex. getting stuck in customs), and the applicants almost missed the deadline to submit everything.
This usually isn't a problem if everything was shipped via FedEx (or DHL, etc) as these companies have their own customs processing departments, but there could still be a holdup or delay of some sort. If the documents were shipped via Royal mail or Parcelforce, they will have to go through the regular customs queue with all other international mail upon arrival in the US, and that could take a while.
So just in case there's any kind of delay with the documents getting to you, I wouldn't submit the online application as that will start the clock ticking.