I'd no sooner

This sentence should actually be re-phrased; "No sooner I'd walked into my office this morning, that I saw my boss waiting for me"
SL Don

Could anyone tell me the meaning of *I'd no sooner walked into the office this morning that I saw my boss waiting for me"?

Thanks

I'd just arrived at the office and I saw my boss was waiting for me. Or "...my boss was already waiting for me."

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