https://www.techdirt.com/articles/20180221/09440239275/death-net-neutrality-will-be-official-april-cue-lawsuits.shtml

While the FCC formally voted to kill net neutrality late last year, the actual repeal of the rules doesn't occur until the repeal itself is published in the Federal Register. Sources tell Reuters that with Ajit Pai's agency having completed the finishing touches on its repeal, the publication should finally happen this week. Once that happens, there's a 60 day window before the actual repeal takes effect, meaning the rules will formally end in April:

"The U.S. Federal Communications Commission is expected to publish on Thursday its December order overturning the landmark Obama-era net neutrality rules, two sources briefed on the matter said Tuesday."