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@Opus 17 @Critter-3 Thank you for helping me.

from where I can figure out if I have filed to 8606 form. my bad, that I lost the 2020 tax filing docs. And can access docs(including 1040) from the IRS website
https://sa.www4.irs.gov/icce-core/load/gettrans/pages/availableTranscripts.xhtml

though in one of the transcripts(Wage & Income Transcript) on IRS, I see form 5498 and it mentions:
IRA Contributions:...................................................$6,000.00

But I am not able to find form 8606.

IRS website mentions these type docs available:

Return Transcript

Record of Account Transcript

Account Transcript

Wage & Income Transcript

Note: I have not done any IRA contribution in 2021 tax yr

Edit: corrected form number to 8606