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"Finally, adjusting the flight’s launch window to the late afternoon at Starbase will enable the ship to reenter over the Indian Ocean in daylight, providing better conditions for visual observations."

From the linked article.

It's explained further down the page that this launch time will facilitate the Indian Ocean landing in sunlight, for improved visual capture of that.

For anyone else who was confused and thought this was happening today. It's actually in 12 days:

The sixth flight test of Starship is targeted to launch as early as Monday, November 18.

The 30-minute launch window will open at 4:00 p.m. CT

They call out later launch on the page linked

Finally, adjusting the flight’s launch window to the late afternoon at Starbase will enable the ship to reenter over the Indian Ocean in daylight, providing better conditions for visual observations.