Hello DOSE K Good luck on your wife's visa application..
Rowena can select what day and time she can have an appointment with the VFS office just sort out all the papers you will be submitting, then if your wife is ready to submit then she can have her appointment online..
Just like what me and my husband did i submitted mine friday morning around 10.30 am which was good cause it wasnt really that busy..
Cheers!
Happy New Year!