How can you tell if your block chain is synced

compare the height of the synced blockchain

cardano-cli query tip --mainnet
{
    "blockNo": 5477930,
    "headerHash": "9729d213d87ed891191687db72e037d0036e2323a9cb78d12f336e5cec1313a4",
    "slotNo": 24529931
}

with Latest Block number in the Cardano explorer

EPOCH / SLOT BLOCK CREATED AT TRANSACTIONS OUTPUT (₳) SIZE (BYTES) CREATED BY
254 / 165131 5477930 2021/03/18 19:37:02 3 251707.207573

in the example "blockNo": 5477930 is equal with BLOCK 5477930 so that means the node is in sync

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