Stewart was initially due to join for the 2021 season – having signed a two-year contract in August 2020 – but he was promoted from the early, making his début at
Gent–Wevelgem. In 2021, he finished second at the
Omloop Het Nieuwsblad. The following season, he took his first pro win on stage one of the
Tour de l'Ain and competed in his first Grand Tour: the
Vuelta a España. In 2023, he finished in the top ten on two stages of the
Giro d'Italia, before again winning the opening stage of the
Tour de l'Ain. In 2024, Stewart joined on a two-year contract. ==Major results==