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The US tradcaths tried to estimate their own TFR with an internal survey and came up with 3.6(barely higher than the US as a whole in 1950). https://liturgyguy.com/2019/02/24/national-survey-results-what-we-learned-about-latin-mass-attendees/

It's obviously not high quality data and it's easy to think about how it could be biased downwards and not easy to think about how it could be biased upwards. But, communities living in the modern world(as opposed to Amish, Hasidim, etc) are probably not beating the tradcaths on fertility, so we can treat it as a reasonable upper bound.