Invoices is not available in this version of OCTO Ops. The Coming soon badge on this page refers to the Invoices feature itself, not just to this guide — there is no Invoices list, form, or profile you can open in the application yet.
Invoices still appears in the left navigation under Workshop, but selecting it opens a page-not-found error. Repair costs raised through a Container Depot repair estimate are invoiced from Container Depot's own Invoices screen instead.