His karting highlight came in 2017, when he won the CIK-FIA European Championship in the OKJ-category on his first attempt, having beaten the likes of Hadrien David, Zane Maloney and Jack Doohan.

In Edgar's final year of karting he managed to finish third in the WSK Super Master Series, having remained with Forza Racing.

He signed for Van Amersfoort Racing, partnering fellow Red Bull Junior Team member Jak Crawford.

[9] He qualified 12th and thus started on pole on his debut as a result of reverse grid, and finishing that race in fifth place gave him his first points in Formula 3.

However, in September 2021, Edgar was nominated for the Autosport BRDC Award and was selected as one of the four finalists together with Louis Foster, Ollie Bearman and eventual winner Zak O'Sullivan.

[10][11] In November 2021, Edgar switched to reigning team champions Trident for the post-season test at Catalunya, driving alongside Roman Staněk and rookie Zane Maloney.

A scoreless round at Budapest came next, although Edgar would finish off the season in a positive manner, scoring points in all of the remaining six races, being the only driver to manage this feat.

[20] Edgar ended up twelfth in the standings, having helped Trident to the runner-up spot in the teams' championship and become the highest placed driver to have missed at least two rounds.

[28] In September 2017, Edgar was named as one of four new signings to the Red Bull Junior Team, alongside Dennis Hauger, Jack Doohan and Harry Thompson.

[33] At the back end of 2023, Edgar made his sporscar racing debut in the British GT Championship, driving a McLaren 720S GT3 Evo for Garage 59 at the season finale in Donington.

[34] Edgar would switch into endurance racing on a full-time basis for 2024, driving in the 24 Hours of Daytona as part of the Sean Creech Motorsport lineup in the LMP2 class, before embarking on a campaign in the European Le Mans Series, where he would be partnering Robert Kubica and Louis Delétraz at AO by TF.