Relax. It's still going to be a gorgeous day and it'll get cloudier in the evening, but nobody is calling for any measureable rain before Saturday morning (including Wunderground and AccuWeather - they're only talking about a couple of spritzes that would put down <0.01" of rain). Nobody. The NWS and most other sources won't even say "slight chance of showers" when that chance is less than 20%, which is the case for Friday evening. 90% of dry days carry a 10% chance of a shower at some point.
Furthermore, the NWS in their most recent update is still calling for mostly cloudy, cool and dry conditions for the game, with precip chances less than 5% during the game as per the graphic below. I'll take their forecast made by expert meteorologists with local expertise, over that of every other service. They're far from perfect, but nobody's perfect in this business.
Could they all be wrong and we get some minor measureable rain during the game from the remnants of Harvey? Of course, that's a possibility, but it's a very low probability outcome and not one I'm particularly worried about at this time. And if that threat does actually materialize we'll all know about it before the game and people can then prepare for it.