A Labour government is, of course, preferable to the Tories. However they too are a Unionist party and not likely to agree to another referendum from Holyrood.
They’d be better to chip away at the two main cases for Scottish independence: 1) Closer and closer ties to the EU if not rejoining in some form (EEA membership for example) 2) hatred of the English by being more collaborative with Scotland in the running of the UK.
These two things might weaken the case for another referendum.