[Paul R.]

You may be referring to La Palma. Good, non-hyped article here:

https://noc.ac.uk/news/could-flank-collapse-la-palma-cause-tsunami

Note the MUCH larger volume of material involved: 350 cu. kilometers (La Palma) is roughly 4 orders of magnitude greater, if I did the math right...(!)

[Paul R.]

I looked around a bit, and tend to agree with Wikipedia: A reasonable estimate for a “worst case” La Palma tsunami when it reaches the mid-US Atlantic coast is 9.6 meters.

Call it 32 ft. on the Florida east coast.

That’s still QUITE a problem, depending on the tide then ongoing, etc. Luckily, such a collapse is considered not likely, soon. (Gotta hope the “considerers” are right.)