Not sure how accurate these estimates are (the very exact numbers their model spits out are a delight though)
CapWages provides the latest NHL salary cap data and player contracts.
capwages.com
Rantanen 8 years at $14,099,414
Marner 8 years at $12,975,404
Boeser 7 years at $9,347,024
Tavares 3 years at $8,232,874
Chychrun 7 years at $8,094,838
Marchand 3 years at $8,055,399
Ehlers 6 years at $7,759,607
Pionk 6 years at $7,177,883
Ekblad 7 years at $7,089,146
Nelson 3 years at $6,951,109
Giroux 2 years at $6,901,811
Provorov 5 years at $6,606,019
Duchene 3 years at $6,566,580
Bennett 6 years at $6,497,562
Drouin 4 years at $6,063,734
Palmieri 3 years at $5,905,978
Hill 4 years at $5,865,679
Benn 2 years at $5,708,784
Gavrikov 5 years at $5,560,888
Burns 1 year at $5,491,869
Mangiapane 4 years at $5,472,150
Zucker 2 years at $5,383,412
Orlov 3 years at $5,117,200
C. Lindgren 2 years at $4,949,584
Vejmelka 4 years at $4,910,145
Granlund 2 years at $4,762,249
Kuzmenko 2 years at $4,594,634
Hall 2 years at $4,555,195
Smith 2 years at $4,496,037
Gourde 3 years at $4,436,878
Frederic 4 years at $4,229,824
Roslovic 3 years at $4,141,086
Suter 4 years at $4,052,349
Greenway 3 years at $3,983,575
Iafallo 3 years at $3,825,575
Fabbro 3 years at $3,825,575
R. Lindgren 3 years at $3,825,575
Ceci 3 years at $3,756,557
Appleton 3 years at $3,756,557
Evans 4 years at $3,638,240
Kane 1 year at $3,500,204
Nyqust 2 years at $3,431,186
Grzelcyk 2 years at $3,401,607
Lankinen 2 years at $3,391,747
Dumoulin 2 years at $3,174,833
Maatta 3 years at $3,174,833
Bjugstad 3 years at $3,155,114
Savard 2 years at $3,017,077
Allen 2 years at $2,810,023
Raddysh 2 years at $2,770,584
Brown 2 years at $2,760,724
Schmidt 2 years at $2,731,145
Armia 2 years at $2,602,969
Perbix 2 years at $2,593,109
Georgiev 1 year at $2,583,249
Dowd 2 years at $2,563,530
B. Tanev 2 years at $2,524,091
Eller 2 years at $2,524,091
Skinner 1 year at $2,494,512
Namestnikov 2 years at $2,474,792
Donato 2 years at $2,455,073
Emberson 2 years at $2,435,353
Dadonov 1 year at $2,376,195
Andersen 1 year at $2,307,177
Samsonov 2 years at $2,277,598
Robinson 2 years at $2,208,579
Kunin 2 years at $2,188,860
Johansson 2 years at $2,169,141
Suter 1 year at $2,169,141
Petry 1 year at $2,100,121