OK, at some point when the synchronization of that block comes, the balance will appear, but will you be able to send those coins even though the wallet is not fully synchronized? Or you will have to wait until he finishes sync?
I had to wait until the synchronization is complete. I was able to fully synchronize the wallet yesterday and to get recent block, I moved the funds. From this experience I realized the necessary of taking note of the block height. Next time I will not need to wait this much longer even if I don't have the current data in my drive.
Feather wallet is syncing much faster (try changing node connection, it looks and works very similar like Electrum wallet.
You could also try some alternative mobile wallets like Stack wallet or Cake wallet, but I think it's much better to use some hardware with monero support in future like Trezor, Onekey, ledger.
It was with a hardware wallet. The main difference between feather and Electrum fork is the synchronization time. Electrum synchronize quickly, in just a few minutes [its not downloading the entire blockchain or all data from a time given from back] but feather wallet starts downloading all blocks [that's what I understood] from the given block height. Imagine you are starting it from the 1st block, you are downloading the whole blockchain.