To the best of my knowledge the tanks are simply amassing at the #Rafah crossing and the invasion has not yet begun. (although bombing of Rafah is intense, with some reports saying those tanks are involved in the bombing)
from Reuters: The United States is concerned about Israel's latest strikes against the southern Gaza city of Rafah but does not believe they represent a major military operation, a U.S. official said on Monday. https://www.haaretz.com/israel-news/2024-05-06/ty-article-live/idf-three-soldiers-killed-near-gaza-border/0000018f-4ba4-dcda-abcf-6ba7979b0006