Yes, 50K miles, plus 5K for an authorized user (AU), is the current public offer.
https://creditcards.chase.com/travel...nited-explorer
To learn when the offer increases, one might want to bookmark that link and check it periodically, or follow this thread in the FlyerTalk (FT) Chase Subforum.
https://www.flyertalk.com/forum/chas...orer-card.html