After you file

Ive filed my 2019 taxes using turbo tax. Ive received my income tax through direct deposit just like I set up with the app. My question is that the IRS is saying my stimulas check will be mailed to me but I was under the assumption that it was going to be direct deposited as well. Why is it veing mailed instead of direct deposited? And can I change it to direct deposited if it is being mailed?