Step parents are allowed to skip the pre-placement report (RCW 26.33.220), but after you file you will still need a post-placement report (basically a home study/interview to make sure it's in the child's best interests to finalize the adoption); timeline depends a lot on scheduling with the adoption investigator and completion of background checks.
You say both that it is not uncontested and the birth parent is on board, so it's unclear which you meant, but if the latter is true and you actually meant that it IS uncontested, your local court has a great resource with forms and contact information for their case workers: http://www.co.pierce.wa.us/?nid=1086
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