We got married successfully on the 15th May and submitted the online application on May 17th (UK time) / May 16th US time after getting certified copies of our marriage certificate from the recorder's office in Vegas.
Thankfully my wife's biometric appointment was successfully done just earlier today (I arrived back in the UK this morning after an overnight flight).
She has sent her biometric sheet along with all the necessary original paperwork (including her passport) that we were advised in this thread using VFS Global courier today (including her passport) plus we also included a complete copy set in the package too along with a hardcopy set she is keeping on hand. We are using priority service for this visa.
Thank you again to everyone for your help! Now we have to wait and pray that we did it all correctly and that it all gets approved efficiently and successfully!