New user with a Sony A7III looking for help on Flash

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My background is actually a Minolta camera user. Started with a Minolta SRT 101. Later upgraded to Minolta 700si with 5400HS Then MAXXUM 7 finally MAXXUM 7D & HVL-F56AM. Recently, I have purchased a Sony A7 MK3. I have bought a LAEA4 adapter to use my A mount lenses. I have 2 older flashes (5400 HS & HVL-F56AM) is there I way I can use these flashes? if so how?  I am seeking your help to invest further.