Sounds like you've got a good plan in place by taking a week off work. I've been thru WD process countless times (mine was from norco, oxy, and sometimes fentanyl) and for me the worst of things was always over by day 4-5. Just like everyone else above me here has said, I also think you'll be able to go back to work after your week off and be able to work. That's not to say you'll be feeling 100% again but I really think you'll def be past the worst of things and feeling better physically.
Typically for me, after that first week went by and the physical WD part of things was getting much better, the mental part of things was becoming more challenging. And really that's the part that you should also really plan ahead for - depression, anxiety, strong urges to use, etc, can become intense. Having a plan in place for that stuff, just like you've got for your first week of WD, is really important. Honestly I never really had a strong plan in place for any of the mental stuff and would always relapse within a couple weeks or so. I've been going a different route this time and have been using suboxone to help with things, and for me it's been extremely helpful.
I guess basically what I'm trying to say is that I'm pretty sure you'll be physically ready to go back to work, but just want to encourage you to plan ahead for what comes after the acute physical WD. I'm sure you've seen the acronym PAWS around here - post acute withdrawals.
Best of luck to you, and there are some very informative threads here that can be helpful for the PAWS part of this, as well as the initial WD.