The new software update for Galaxy S10 5G can be identified by firmware version G977BXXS8FUE5. Samsung has now released the June 2021 security patch details according to which, it fixes 2 Critical, 27 High levels, and 5 Moderate levels Common Vulnerabilities and Exposures (CVE’s) for system security improvements. This is a minor security patch and hence does not bring new features, improvements, or UI changes. The June 2021 security update for Galaxy S10 5G is currently spreading in Switzerland and should start reaching other regions in the next few days. To manually check for the latest update, navigate to Settings » Software updates. [source]

G977BXXS8FUE5   Galaxy S10 5G June 2021 security patch update - 82