Ukraine is the fifth largest producer of wheat and has reduced crop sizes due to the war. This is being offset by other producers like Egypt increasing production because there's a market incentive to do so. Will this result in a food shortage? Technically, yes. Will this result in some sort of noticeable food shortage? Probably not, unless people start talking about it and causes people to buy an unusually high amount of food resulting in a self-fulfilled prophecy. Will that be catastrophic? Almost certainly not, it'll be like Covid again when preppers buy all the pasta for a few weeks - an inconvenience.

What is the absolute worst advice to give? To tell people to go out and prepare. That will cause issues.