While the Kangaroos were forced to dig deep to overcome holders New Zealand in the opening match of the 2011 Gillette Four Nations Series at Warrington on Friday night, England were in cruise mode against Wales on Saturday afternoon.
Tomkins ran in a tournament record-equalling four tries in a 42-4 victory at Leigh Sports Village that he believes has created the platform for the national team to secure their first series win over Australia since 1970.
It is the Kangaroos next for England at Wembley on Saturday, followed by a clash with the Kiwis in Hull, and Tomkins believes both opponents looked vulnerable in their opening encounter.
"Nothing worried us from what we saw," he said.
"Both teams played well in patches and they both showed some flaws which we're going to try and exploit next week and the week after.
"They are both quality teams and we'll respect them, but this is the strongest squad I've been involved in and, if we're going to do it, I think now is the time."
Tomkins gave England a dream start with two tries in the first 15 minutes and doubled his tally in the second half to match Tony Clubb's four tries against Papua New Guinea last year and take his total to 11 in just 10 appearances for his country.
"It was nice, it's always good crossing the tryline," the Wigan full-back said.
"I just got in the right place at the right time. There were any number of lads who could have scored."
Tomkins knows England will need to go up a gear against the Kangaroos but, following on from an encouraging 32-18 warm-up win over France, he believes they are on the right track.
"After a tough hit-out last week against France there were areas where we needed to improve and we did that for the majority of the game," he said.
"Wales played a lot on emotion. They were saying this was the game they could shock people and we knew it would be a tough test.
"We're under no illusions. We're not going to be scoring 30-odd points every week in this competition.
"We're going to have to get better and better throughout the next two or three weeks if we are going to be at Elland Road picking the trophy up."
Victory at Wembley, where the national team have not played since 1997, would enable England to put one foot in the Elland Road final and provide rugby league in this country with a major boost.
"It's a massive occasion," added Tomkins, who was a member of the Wigan side that lifted the Challenge Cup at Wembley in August.
"There is probably nothing better than playing the Aussies there.
"We've not beaten them for how many years now? It's about time we did. We're a growing sport in this country, we're getting there, and it would be massive if we won."