Timing the ATM call entry for NVDA earnings

I want to buy an ATM call for NVDA before earnings on the 28th.

When would be the best time to buy?

I have a few scenarios in mind

1. Buy near the close -> probably most expensive, but you won't get burned throughout the day if it goes against you massively. Only exit is selling the next day.
2. Buy near the open -> "cheaper" but will get more expensive as the day goes on. If the stock goes against you, you can still make $$ due to expanding IV. If it goes against you massively, then you might lose out. Sell at end of day (IV would be the largest so you can make a profit even if you were wrong about direction?)

Curious what anyone has done in the past and experience with the above options.