No, it looks like Shipping.USPS has not yet been upgraded for 4.30 in the marketplace. (FYI, the FedEx plugin has not been upgraded yet either - the versions listed on the marketplace listing is a typo. Currently, the download only has folders with 4.00, 4.10, 4.20.)
I downloaded the plugin packages from the github repo and it appears someone has been working on them based on the commits. I placed them in my dev setup and rebuilt the nop project with success. Although I have not had time to do any actual testing to see if they are working properly. Dealing with other issues between my themes update and v4.3 at the present. It appears the team is working more on v4.4 than the plugins but that's just speculation on my part.