There are multiple B550, X570, Z490, and Z590 motherboards that support DDR4-5200+. However, these new kits are listed up to DDR4-5333 almost only on Z590 motherboards. Count maybe 3x ASUS ROG, 3x top MSI, 2x top ASRock, 3-4 top Gigabyte.
Even though B550 should handle up to DDR4-5600 and some motherboards have memory kits up to this speed on the QVL, then barely any new Hynix DJR based kit (count these HyperX too) is listed on AMD. There are "older" DJR up to about DDR4-5000. This is also because most Ryzen 5000 CPUs will hit a wall at DDR4-5000 or even lower clock. Only Ryzen 4000 will go up to DDR4-5300+. Also, B550 motherboards support higher memory frequencies than X570.
In short, you need Z590 motherboard and 11th gen CPU to run RAM at DDR4-5000+ without issues. It will still require high voltages but will probably work at XMP settings.
In my tests it was about like:
B550 (ASRock, ASUS) - DDR4-5100 stable with Ryzen 5900X, DDR4-5000 stable with Ryzen 5600X/5800X
B550 (ASRock, ASUS) - DDR4-5300+ stable with Ryzen 4650G
X570 (ASRock, ASUS, MSI) - DDR4-5000 stable with Ryzen 5900X, DDR4-4866 with Ryzen 5600X/5800X
X570 (ASUS, MSI) - DDR4-5200 stable with Ryzen 4650G
Z490 (ASRock, ASUS, MSI) - DDR4-5000 stable with i9-10900K
Z590 (ASRock, MSI) - DDR4-5200 stable with i7-11700K
Results with Micron B and Hynix D. Samsung can't make much above DDR4-5000. There is also the "luck" factor as not every CPU is the same.
Some Z590 motherboards have support up to DDR4-5600+ and some memory kits at this speed are on the QVL. I assume we won't see them in stores. Anyway, you can set DDR4-5600 on something like MSI Z590 Unify ITX/ATX/-X, Gigabyte Z590 Tachyon, ASUS Apex or ASRock OC Formula. It will still require good IMC and very high voltages (at least compared to regular values).
Here is valid at DDR4-6400 with HyperX Predator RGB DDR4-4600 made a couple of days ago on MSI Z590I Unify -
https://valid.x86.fr/quwxlt
Not stable but it's full air/stock cooling.