If you are claimed as a dependent in 2019 then you are not eligible for the stimulus payment.
My girlfriend just did her taxes last week and already got her stimulus but I did mine March 31st 2020 and haven't gotten mine, why is that?
Did you efile your return and was it accepted? Did you have direct deposit information on the return? Either of those things could slow your payment. As with most things the IRS does, it's not possible to predict when people will get their payment. You will be able to track it on an IRS online portal in mid April. See this for where to look for the portal: https://www.irs.gov/coronavirus/economic-impact-payments
The IRS is responsible for selecting the order in which the stimulus payments are sent. Fortunately, the IRS is rolling out the "Get My Payment" tool in mid April. According to IRS.gov, you can use the "Get My Payment" application (coming mid-April) to:
Update your information
Direct deposit: Use the Get My Payment application (coming mid-April) to let us know your bank account information if we don't have your direct deposit information and we haven't sent your payment.
@Josh126