We don't know the future, but we can analyze the past. Polls are a trailing indicator, usually a few days behind poll numbers. Of course the hearing were never the only news of the day or week.
At any rate I present this chart, which comes from RealClearPolitics's 2022 Generic Congressional Vote for your own analyses. The blue line represents Democrats and the Republicans are red. The blue arrows represent to the dates of the hearings.

1. June 9, 2022. Witnesses, most of whom are Republicans, and some Trump loyalists. Footage of the attack. Testimony from a documentary filmmaker and a member of the Capitol Police.
2. June 13, 2022. William Barr testified that Trump had "become detached from reality".
3. June 16, 2022. Examined how Trump and others pressured Vice President Mike Pence using John Eastman's fringe legal theories as justification.
4. June 21, 2022. Election worker Wandrea "Shaye" Moss. Election officials from Arizona and Georgia who testified they were pressured to "find votes".
5. June 23, 2022. Focused on Trump's pressure campaign on the Justice Department to rubber stamp his narrative of a stolen election.
6. June 28, 2022. Cassidy Hutchinson
7. July 12, 2022. Roger Stone and Michael Flynn connected Trump to domestic militias.
8. July 21, 2022. Evidence and details of Trump's refusal to call off the attack on the Capitol.