Why hasn't my second stimulus check hit my account yet

[NCperson]

they technically do not begin until Monday; some banks jumped the gun

check here beginning on Monday:

https://www.irs.gov/coronavirus/get-my-payment

Turbo tax has nothing to do with the stimulus payments - it's the IRS that is responsible 

[xmasbaby0]

TurboTax has NO control over your stimulus check, nor can TT track it or tell you when you will receive it.  The IRS will use the same banking information for the 2nd stimulus that they used for the first one.  If that account (or card) is closed then the stimulus will go back to the IRS and they will mail you a check.

See this information from the IRS:

https://www.irs.gov/newsroom/treasury-and-irs-begin-delivering-second-round-of-economic-impact-payme...