After you file

That is just general information about refunds.

https://www.irs.gov/taxtopics/tc152

2018 will  never show on the IRS site - that is only for the current 2019 tax year.

The stimulus is automatic after the 2019 tax return is processed - and that might take a while because the IRS is not currently processing mailed returned.

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**NOTE*** Due to the Corona virus the IRS is operating short staffed. All field offices are closed and some processing centers are all but closed. Any tax return that requires hand processing will probably have long delays. Mailed returns are not being processed at all at this time. Most phone service has been curtailed.
https://www.irs.gov/newsroom/irs-operations-during-covid-19-mission-critical-functions-continue
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TurboTax only gives the general IRS (most returns are processed within 21 days) date. The actual date is known only by the IRS. TurboTax also does not adjust the general date for anything on the tax return. TurboTax receives no feedback from the IRS after filing.

The IRS says most refunds will be issued within 21 days - some faster, some longer.

Each tax return is evaluated on it's own merits. There is no first-in-first-out. Two similar tax return submitted at the same time can have totally different processing times based on IRS criteria for examining tax returns that the IRS does not divulge.

Some returns will be held for ID verification or other verification. The IRS will send a letter if they require more information to process your tax return.

https://www.irs.gov/individuals/refund-timing

Check your refund stratus here:
https://www.irs.gov/refunds

Check your state refund here:
https://ttlc.intuit.com/questions/1899433-how-do-i-track-my-state-refund