Visit VoteWA.gov ! You can also check your registration status, update your address, and see if your ballot has been received/accepted.
And if you are going to be out of town, you can also set up a temporary seasonal address so your ballot gets mailed to wherever you will be.

The funny thing is that vote at home states have several weeks to vote, there's multiple days off already included there in the weekends. So work doesn't have to interfere with voting at all...