You forgot the rest.

18 For truly I tell you, until heaven and earth pass away, not one letter,[a] not one stroke of a letter, will pass from the law until all is accomplished. 19 Therefore, whoever breaks[b] one of the least of these commandments and teaches others to do the same will be called least in the kingdom of heaven, but whoever does them and teaches them will be called great in the kingdom of heaven.

Jesus is explicitly speaking on the law and prophets, meaning the Torah and Nevi’im, basically the entire old testament. He said not a single stroke of a letter will pass from the law until heaven and earth pass away, meaning FOREVER or until end times when a new heaven is created on earth, depending on your interpretation.

Seeing as earth is still here, all has not been accomplished.