7.6.0, which is the next lts version of PowerShell will target the recent GA of .NET 10. I expect that we should see 7.6.0 of PowerShell reach a GA release pretty soon, but how soon, I couldn't provide an exact timeline to expect it, though this commit 2 weeks ago updated the .NET SDK to the .NET GA, so it probably isn't far off being released.

The current 7.6.0-preview.5 release (the latest one right now) currently targets .NET SDK v10-preview.7 from this PR and may allow you to test most .NET 10 functionality that you may need in the meantime, unless you want to go through the process of building PowerShell from source.