According to multiple reports, the deal is not imminent and will be steered by the Marlins' demands for top-level prospects.
Yelich would come at a steep price. He's highly rated defensively and as close to a five-tool player as the Marlins have in the organization because of his speed, range and throwing arm. Yelich is under team control for five seasons, making him a very good fit for the rebuilding Braves.
Realmuto, under team control for three more seasons, could boost the Braves offensive and defensively.
Under new ownership and the guidance of CEO Derek Jeter, the Marlins are stripping down the roster and looking at a long-term rebuild. In December, the Marlins shipped Giancarlo Stanton to the New York Yankees and Marcell Ozuna to the St. Louis Cardinals. Yelich, the third starting outfielder alongside Stanton and Ozuna last season, could net an even larger return because of his relatively modest salary, age and years before hitting free agency.
Yelich has a .290 career average and was a doubles machine at Marlins Park. The Braves are well armed defensively in the outfield with Gold Glove center fielder Ender Inciarte and Ronald Acuna, widely regarded as one of MLB's elite prospects.