I have some Pseudata iris that get up to 4 feet or more.

are there any TB iris that get this tall? or taller?

It's a little unusual for a tall bearded iris to be that tall, but there are around 200 with a registered height of 48 inches or more. There are also over a 1000 TBs with a registered height between 42 and 48 inches. Many of those would probably grow past four feet under the right conditions.

I had a TB seedling last year that topped out at over 60 inches tall so they are certainly capable of reaching 4 feet plus. I suspect most really tall TBs end up in the compost pile (like my seedling). The taller they are, the more vulnerable they are to weather, particularly wind.

I had two TB's over 4 feet last year and you really do need to stake them in bad weather. One grew to 54 inches and I had to tape two stakes together to be tall enough. While eye catching, that tall is very difficult to keep standing.