Today, Samsung released the first software upgrade for the Galaxy A54. It includes camera enhancements as well as the standard stability and bug patches.
Notably, the firmware does not include an upgrade for the February security fix.
The Version A546BXXU1AWC4/A546BOXM1AWC5/A546BXXU1AWC4 is approximately 230MB in size. You should be able to locate it in Settings under Software update.