This time tomorrow, he'll probably be skiing at Zaō.

Literal

Tomorrow [possessive-の] this-about-time, he [topic-は] Zaō [at-で] skiing [object-を] be-doing probably.

蔵王 (Zaō) is a famous ski resort straddling Yamagata and Miyagi prefectures in northern Japan, known for its 'snow monsters' (樹氷) — ice-encrusted trees formed by freezing wind. A cultural reference a learner might not catch without the context.