<p>NEW YORK – Is it time for the <a class="Link" href="https://chicago.suntimes.com/cubs" >Cubs</a> to start making big league plans that include slugging prospect <b>Josiah Hartshorn</b>?</p><p>“Not yet,” team president <b>Jed Hoyer</b> said last week. “He’s 19.”</p><p>But excuse fans for getting excited about Hartshorn, the 2025 sixth-round draft pick who is tearing up the lower levels of the minor leagues in his first taste of pro ball this season.</p><p>The switch-hitting Hartshorn woke up Tuesday batting .302/.421/.559 with 13 home runs and 56 RBIs in 63 games split between Class A affiliates in Myrtle Beach and South Bend. He’s a recent addition to MLB.com’s rankings of the top 100 prospects in the sport.</p><p>It’s thrilling for Cubs fans waiting for the next big thing.