Trump is getting close again to his all-time highs now at 52.4%. If anything Ramaswamy of all people is the one to watch as he's overtaken Pence for third. Don't expect him to go much higher though- he's got a very hard ceiling of potential support.
The state polling is fairly similar. Trump is smoking DeSantis in the first four primary states. DeSantis isn't even winning in Florida. He's not leading in any state primary polling.
Unlike the Dem primary, Republicans have a lot of winner take all delegates, so things are likely even worse for DeSantis here. Plus changes this year are likely to be even more favorable to Trump- some states are moving to closed caucuses instead of primaries. At this rate Trump will likely win most of the delegates.