Just drop "a google company" from your website (which is where people are buying your products). That seems like the most sensible option, unless there's now some indication that the deal may not go through.
There are a lot of rules about what a sold company can do. IANAL but it probably makes the most sense to just act as though you're not sold until the deal is final.
It's not sold until the deal is closed. Till then, it is a Google company.