Can't find updates anywhere to know how long the delay is for.
Haven't found any specific information for FIFA, but if it's anything like America, it's a 30 minute delay if there is a strike within an 8 mile radius (12-13kms) of the stadium, or there is audible thunder.
The 30 minutes starts again everytime a strike occurs within the radius thereafter. Funnily enough lightning can actually strike up to between 25-40kms from a thunderstorm as well, so there is always some risk even after a storm has passed - The more you know. 💫