How much would it cost to replace or rebuild the engine for my 2016 Lexus GX460?

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Noticed car overheating while on the road stooped to check and noticed coolant leaking. So filled it up and made to the destination. The next morning I took it to the local shop and told that there's a large crack in the radiator and he has to order the part which will be few days so I decided I would take it to closest dealer. Then on the drive back the engine shut down as I arrived home. I got it towed to the dealer and the weekend service person called to say I need my engine rebuilt. I'm just trying to get my mind prepared for the shock 😭😭 Will I need to start selling my engagement ring?