Actually the dialog implies the "Hand of Omega" traveled through time when it approached Skaro's sun. Here's the transcript.
DAVROS: I will teach you the folly of your words, Doctor. I will destroy you and demonstrate the power of the Daleks!
DOCTOR [on screen]: Davros, I beg of you, don't use the Hand.
DAVROS: Ah, Doctor, now you begin to fear.
DOCTOR [on screen]: You're making a grave mistake.
DAVROS: Activate the Omega device!
DALEK: Omega device activated.
(A little star flies out of the Mothership.)
DALEK 2: Plotting course to home planet Skaro.
DAVROS: Now the Daleks shall become the Lords of Time!
DALEK 2: Entering Skaro time zone
. First stage expansion. Primary neutrino release.
DALEK: Core collapse instigated.
DALEK 2: Danger! Instability! Reaction out of control.
DAVROS: No, this cannot be correct!
DALEK: Home planet Skaro about to vapourise.
(The Hand leaves the system as the star goes supernova and takes the planets with it.)
Hopefully someone else can remember the line, but earlier in that serial, I believe it's stated the Daleks had traveled back in time to 1963. So the "Hand" actually made Skaro's sun of the distant future
(relative to 1963) go supernova.