There is no way to know if it was delivered until you see a notation regarding it the the "where's my refund" tool as follows:
Tom
Ok thanks..since I didnt pay for tracking service I guess I'll just have to wait...in the meantime how can I file for the 1400 stimulus?
Wait for the IRS to process your 2020 income tax return that you filed. They will probably send you the $1,400, if you qualify, after your 2020 tax return is processed, which may be sometime in the summer. The IRS has a backlog of around 12 million tax returns.
If you don't get the $1,400 in 2021, you'll be able to claim a credit on your 2021 income tax return. like you did for the first and second stimulus payments, on your 2020 income tax return.
To be eligible for the third stimulus, you need to meet the following requirements: