Are the segwit addresses available on Electrum wallets ?
yes. You can have a segwit addresses starting with 3 on electrum (better then the one starting by bc1 used by default as segwit on electrum).
1) generate a bip39, 12 words seed on
https://iancoleman.io/bip39/ (use it offline for more security)
2) on electrum choose, create new wallet, I already have a seed, then on "options" choose bip39, paste the seed then click next
3) on derivation path path use: m/49'/0'/0'/0
that's all. Remember to save in a safe place the seed as electrum will not show it (read below)