My 2024 Land Cruiser Premium with Leather seats are holding up well.
We clean them with leather cleaner on a soft microfiber towel, then use a smaller hand held steamer with a thicker microfiber cloth to cover the metal surface and lightly go over the seats to remove extra dirt. Suggest testing any product you apply and any process in a small area first.
Heat tends to be the best solution to tighten back up the leather to remove creases and or waves. You will need to be very careful with a smaller handheld steam iron, or a regular clothing steam iron, and or a heat gun, covering the leather area with a medium thick microfiber towel that has some moisture on it.
I would suggest search the internet for videos on best practices for cleaning and tightening up leather seats, there are several videos that can help you with this process.
Once you complete this process, wipe the seats down again, let them dry completely. Next step is to apply small amounts of leather conditioner to the seats on a microfiber towel in thin coats until the leather is restored. This process is very important due to the perforated leather seats, small amount of leather conditioner evenly distributed on a small area of the towel will help minimize excess conditioner in the perforated holes.
With hot summer and the cold winters, the leather can get dry, stretch and brittle overtime, cleaning and conditioning the leather seats will make a big difference.
I like to think about this process like a good pair of leather shoes, conditioning them, polishing them revitalizes the leather and makes them like new again.
I do this process twice a year on my fully restored 1991 Volkswagen Vanagon Westfalia pop top camper Van with Leather Recaro driving seats.
The Recaro Seats are 12+ years old now and still look like new, I follow this maintenance rule for all my vehicles with leather seats.
New Land Cruiser "leather" seats are rarely 100% genuine hide; they are typically "leather-trimmed" featuring real leather on seating surfaces (butt/back) and synthetic material on sides and backs. Toyota calls this durable, synthetic alternative SofTex®, which is a polyurethane material designed to look and feel like leather.
Take your time and be very careful. The heat and steam is very effective on the leather although you’ll want to be very careful on the SofTex material.
Good luck on your project, I hope this helps.