H-1B extension eligibility tied to visa petition filing
Under 8 CFR 214.2(h)(13)(iii)(D), H-1B extension eligibility requires at least 365 days pass since an immigrant visa petition was filed with USCIS.
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uscis.gov
Alternatively, under 8 CFR 214.2(h)(13)(iii)(D), you may be eligible for an H-1B extension beyond the sixth year if at least 365 days have passed since a labor certification was filed with the Department of Labor on your behalf (if such certification is required) or an immigrant visa petition was filed with USCIS on your behalf.