I wrote about this data lag back in 2018 (have updated the layout just now)....
https://virologydownunder.com/flu-may-not-be-peaking-even-if-it-looks-like-it-is-right-now-and-heres-why/
https://virologydownunder.com/flu-may-not-be-peaking-even-if-it-looks-like-it-is-right-now-and-heres-why/
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2024-2025 sets a record at 12.8 /100k...
2017-2018 was the previous biggest year (10.2/100k at peak) over the past 15 seasons from 2009-10 onwards.
Be aware of late fluB season this-its currently rising.