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Upgrade to Shimano GRX / Compatability

I have a 2016 GT Grade Alloy 105, with FSA BB and crankset  and TRP Spyre mechanical / hydraulic brakes.

Needing a new BB, cassette and chain anyway, I am planning to upgrade to Shimano 1x, can I use my existing 5800 levers with the brakes?

I am changing to RX812 Rear mech, Rx 810 11-42 cassette, RX 810 chainset, HG701 chain. I am finding the range / compatability difficult to get my head round, despite finding the Shimano compatability document online. Thanks in advance.

If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.

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