How do I tell if initial geth sync is done in 'light' mode on testnet

Question

I just installed geth on Windows 10. Then I did the initial sync in light mode on testnet, and my status is as shown on the screenshot below.

I have two questions (related):

1. How do I tell if the sync is done?

2. If it is done, can I now close this command window before I start my experiments, say a "Hello, World" smart contract.

Update:

I tried geth attach as suggested by abattia, and got this error:

Answer 1

How do I tell if the sync is done?

For Windows 10, from another terminal enter: geth attach ipc:\\.\pipe\geth.ipc. Assuming the geth console opens OK, then enter eth.syncing. If you get the response false, then the node thinks it is synced. Otherwise, the command will return information about the status of the syncing (currentBlock, highestBlock, knownStates, pulledStates, startingBlock).

If it is done, can I now close this command window before I start my experiments, say a "Hello, World" smart contract.

Best to leave that terminal open, and do the rest of your tests from another terminal.