Not always – most of my long distance driving I do at night and quite routinely Google will sort me a route and then half way down it will adjust as it realises a road is closed. Had a nightmare with roadworks closures on the M1 a couple of weeks ago compounded by a junction closure on the M40 so I couldn’t hop across
This is more likely down to your driving. Google works on average time taken for a journey so if you’re averaging 60 on the motor way closures it expected you to be clear of before they came oni force will start to be an issue, equally average 80 and you’ll be clear before they come in or you’ll hit closures that should have been removed because your going to arrive at them sooner than expected.
I often get the former when driving vehicles with a non 70 limit over night. Obviously if you’re towing you’ll also have extensive experience of this.
OP, assume the unconfirmed bit is a no if you’re looking same day. The permit has been applied for and granted is just the contractor hasn’t confirmed to highways England they’ll actually be there, which they need to do, before commencing work.